Butterfly Halfmoon Betta Male (Betta splendens)

Butterfly Halfmoon Betta male (Betta splendens) is a domestic ornamental Siamese fighting fish selected for broad, flowing finnage and a contrasting butterfly-style colour pattern. The commercial name describes the form: "Halfmoon" refers to a tail bred to open into a broad half-circle when fully displayed, while "butterfly" refers to contrasting colour bands or edging across the fins. It is still one species, Betta splendens, and every fish varies in colour placement, fin spread and body proportions.

This is a single male centrepiece fish, not a pair and not a fish for a bowl. Plan a mature, heated and gently filtered aquarium of at least 20 litres, with 25-40 litres giving a more forgiving margin for stable water, enrichment and normal movement. A close lid, unobstructed surface access, smooth decor and broad resting leaves are especially important for a long-finned male.

The care information below separates the species' broad recorded tolerance from a practical home target. FishBase records 24-30°C, pH 6.0-8.0 and 5-19 dH for Betta splendens; for everyday aquarium care, aim for a stable 25-28°C rather than moving around the limits. Recent controlled welfare studies also show that both usable swimming space and furnishings matter.

Butterfly Halfmoon Betta male at a glance

Scientific name	Betta splendens Regan, 1910
Common names	Butterfly Halfmoon Betta, male Betta, Siamese fighting fish
Family	Osphronemidae
Commercial form	Domestic long-finned male, sold under the Halfmoon and butterfly pattern labels
Natural species range	Southeast Asia; FishBase records the Mekong basin, while domestic ornamental stocks have a long and complex breeding history
Adult size	FishBase records up to 6.5 cm total length; long fins make the visual envelope larger
Care level	Moderate: hardy physiology does not remove the need for heat, cycling, gentle flow and daily observation
Temperament	Territorial male; personality varies from tolerant to strongly aggressive
Minimum aquarium	20 litres for one male; 25-40 litres is a more forgiving solo display
Practical temperature target	25-28°C, stable; the wider 24-30°C record is not a reason to use daily extremes
pH	6.0-8.0 recorded range; stability and acclimation matter more than chasing one decimal
Hardness	5-19 dGH recorded range
Diet	Complete Betta food with suitable frozen or live invertebrate foods for variety
Tank region	All levels, often upper and mid-water with frequent surface visits
Social plan	One male per aquarium; community attempts require more space, calm companions and a ready separation plan

What do Halfmoon and butterfly mean?

Halfmoon and butterfly are trade and show-form descriptions, not scientific subspecies. A Halfmoon male has been selected for a broad caudal fin that can approach a semicircle when the fish fully flares. A relaxed fish does not hold that display all day, and a retail Halfmoon label is not a promise that every individual meets a competition standard at every angle. Age, condition, genetics and momentary behaviour all affect how the tail appears.

The butterfly label describes contrast across the fins, commonly with a strong base colour and a differently coloured outer band. The pattern can be crisp, irregular, marbled or asymmetric. Colour can also develop after arrival as the fish settles, matures and experiences different lighting. The responsible expectation is the named commercial form with natural individual variation, not an exact copy of a rendered gallery image.

Label	What it describes	What it does not guarantee
Halfmoon	A domestic male selected for a very broad caudal display	A constant 180-degree flare, show grade, perfect ray symmetry or a specific fin length
Butterfly	Contrasting bands or edging through the fins	One exact colour palette, a mathematically even band or permanent colour intensity
Male	The sale unit is a male Betta splendens	Compatibility with another male, a female, shrimp or community fish
Representative gallery	A visual guide to the form and possible appearance	The exact dispatched fish, exact colour placement or safe housing of two pictured males

Is this Betta right for your aquarium?

A Butterfly Halfmoon male suits a keeper who wants one interactive centrepiece fish and is prepared to build the aquarium around that individual's welfare. Bettas often learn feeding routines, inspect changes to their environment and rest in recognisable favourite places. Those behaviours are easiest to enjoy in a calm, furnished aquarium where the fish can move freely instead of spending its life in a bare cup or bowl.

A good match if you can provide	Choose another plan if you need
A mature 20 litre or larger heated aquarium	An unheated bowl, vase or temporary desktop container as permanent housing
Gentle filtration with tested ammonia and nitrite at zero	A fish expected to "cycle" a new tank
Plants, broad resting surfaces, shade and open swimming room	A bare decorative vessel with nowhere to retreat
A close lid with a warm, accessible surface zone	An uncovered tank or sealed surface with no air gap
Time to watch the fish and adjust flow, food or companions	A guaranteed low-maintenance pet whose temperament never changes
One male in the aquarium	Two males, a permanent male-female pair or an unplanned Betta community

Read the fuller Betta fish care guide before ordering, and use the aquarium water matcher to compare your tap water with the species range. The fish can be a first tropical species for a careful new keeper, but "beginner" should describe the keeper's preparation, not a claim that the animal needs little care.

Species identity, domestication and natural history

Betta splendens belongs to the gourami family Osphronemidae and is one of the labyrinth fishes. A labyrinth organ above the gills allows the fish to take atmospheric oxygen at the surface. This adaptation helps the species use warm, shallow and sometimes oxygen-poor habitats, but it does not make dirty water harmless. The gills still handle gas exchange and waste excretion, and ammonia or nitrite can injure a Betta even when it can gulp air.

Wild Betta splendens are much less ornate than modern domestic strains. Generations of selective breeding have produced long fins, intense colours, marbling, metallic scales and many named tail forms. Genomic research shows that the domestic Betta story includes complex selection and introgression rather than one simple line from a wild brown fish to every modern variety. Halfmoon and butterfly therefore describe human-selected ornamental traits layered onto the same species identity.

Natural-history records describe standing waters, floodplains, canals and rice-growing landscapes with vegetation and surface cover. These are structurally complex environments, not empty glass bowls. A home aquarium does not need to imitate a rice field literally, but it should reproduce useful functions: warm stable water, gentle flow, cover, open surface access, places to rest and enough room to investigate.

What current welfare research says about tank size

Betta tank-size advice has often been based on survival, shipping practice or what can be kept clean by intensive labour. Home welfare asks a different question: how much usable space and environmental complexity allow normal activity while reducing abnormal behaviour? A 2024 controlled study compared furnished aquaria of 1.5, 3.3, 5.6 and 19.3 litres, plus a barren 19.3 litre condition. Fish were more active and showed fewer abnormal behaviours in the large furnished aquarium than in the smaller vessels, while the barren large treatment showed that volume alone is not the whole answer.

A separate controlled study found that small bowls suppressed swimming and that Bettas used the space made available to them. Together, these results support a practical minimum around 20 litres for one male, with furnishings and layout treated as part of the requirement. A 25-40 litre aquarium is often easier to heat, filter and furnish without crowding the swimming area. Larger can also work well when the current remains gentle and the fish has resting places near the surface.

Designing a Halfmoon Betta aquarium

Long fins increase drag. A Halfmoon male may be less efficient in strong current than a short-finned Plakat, so the layout should combine calm areas with enough water movement for filtration and gas exchange. Watch the fish rather than relying only on a filter's manufacturer rating. If it is continually pushed away from food, struggles to hold position or hides behind equipment, redirect or diffuse the return.

Plants and resting places

Live plants provide shade, sight breaks and surfaces to explore. Broad-leaved plants such as Anubias can create useful rest points when positioned below the surface, while floating plants can soften the light. Do not cover the entire surface. Leave clear air-access lanes, and remove decaying leaves before they add unnecessary waste.

Silk plants can be used when live plants are not practical, but inspect every edge and seam. Hard plastic leaves, sharp rock and rough artificial caves can split flowing fins. A simple test is to run fine fabric gently across the decor; anything that snags fabric deserves closer inspection before it meets a Halfmoon's caudal and anal fins.

Wood, caves and open water

Driftwood and smooth caves help divide the aquarium visually, but do not fill every centimetre. The fish needs a clear swimming route between shelter, feeding area and the surface. Check small holes carefully because an inquisitive Betta can squeeze into a gap that does not allow an easy turn. All wood and stone must be stable and aquarium safe.

Substrate and lighting

Fine sand or smooth gravel can both work. Choose a substrate that can be cleaned and that does not trap excessive food. Moderate lighting with shaded areas usually shows colour without forcing the fish to remain exposed. A regular day-night cycle is preferable to constant illumination. Night should be genuinely dim so the fish can rest.

Surface access, lid and the labyrinth organ

A Betta must be able to reach atmospheric air. Keep the route to the surface open, avoid a solid mat of floating plants and leave an air space below a secure lid. The lid reduces jumping risk and helps keep the air immediately above the warm water from becoming much colder than the aquarium. Make sure covers do not seal the aquarium without ventilation or obstruct filter and cable safety.

Frequent surface visits are normal. Continuous gasping, rapid gill movement or remaining at the surface without exploring is not automatically "labyrinth breathing" and should trigger checks of ammonia, nitrite, temperature, filter flow and oxygen. The presence of a labyrinth organ is not a substitute for maintaining good water quality and surface movement.

Water parameters: stable beats extreme

Parameter	Working target	How to use the range
Temperature	25-28°C for routine care	FishBase records 24-30°C. Use the middle as a stable home target and avoid rapid changes.
pH	Within 6.0-8.0 and stable	Do not add acids or buffers simply to reach a fashionable number. Match replacement water consistently.
General hardness	Approximately 5-19 dGH	Most ordinary UK tap water can be assessed with testing; extreme hardness or softness may need a measured plan.
Ammonia	0 mg/L	Any detectable ammonia requires immediate investigation and corrective water management.
Nitrite	0 mg/L	Also toxic and a sign that the biofilter is not processing the current load safely.
Nitrate	Keep low and stable	Use the trend to guide maintenance; the exact target depends on source water and the wider system.
Chlorine/chloramine	Neutralised before water enters the aquarium	Use a conditioner suitable for the disinfectant used by your water supplier.

Parameter ranges are not a licence for sudden movement from one edge to the other. A Betta acclimated to moderately hard, neutral water may be more stressed by a rapid attempt to create very soft acidic water than by remaining in stable, clean source water. Test before changing chemistry, record results and make any necessary adjustment gradually in prepared replacement water.

Heating a Betta aquarium in the UK

Most UK rooms do not keep aquarium water steadily within a tropical target through nights, winter and changes in household heating. Use a thermostatic aquarium heater appropriate to the real water volume, position it where circulation distributes warmth and verify it with a separate thermometer. A heater setting is a request, not proof of the actual temperature.

Check the temperature at more than one time of day during the first week. Sunlight, radiators, heatwaves and a tight hood can raise water above the set point, while a cold room or undersized heater can create the opposite problem. At warmer temperatures oxygen demand rises while water carries less dissolved oxygen, so maintain gentle surface movement and never respond to heat by turning filtration off.

Temperature situation	Likely risk	Response
Below the normal target	Reduced activity, appetite or immune resilience if prolonged	Confirm with a thermometer and warm gradually using reliable equipment.
Rapid rise or fall	Acute physiological stress even if both readings sit inside a broad tolerance range	Find the cause and stabilise slowly; avoid abrupt hot or cold water additions.
Persistent high temperature	Lower oxygen margin and faster waste processes	Increase safe aeration, reduce room heat and cool gradually without ice contact.
Unknown because no thermometer is present	The heater cannot be verified	Add a dependable thermometer before livestock arrives.

Cycling, filtration and flow

A cycled aquarium is demonstrated by water tests, not by a calendar. Before the fish arrives, the biological filter must process an ordinary waste load while ammonia and nitrite remain at zero. A tank being wet for four or six weeks is not proof if no ammonia source was processed or no tests were made. Fishless cycling gives the keeper a chance to establish the biofilter without exposing an animal to toxic waste.

Use gentle, continuous filtration. A sponge filter, adjustable internal filter or baffled return can all work when sized and maintained correctly. Filter turnover figures do not describe the experience of a long-finned fish at one narrow jet. Aim for circulation that carries waste towards the intake, moves the surface and still leaves calm resting zones.

Filter maintenance

Rinse mechanical media often enough to prevent clogging and clean biological media only when flow falls or debris accumulates. Use removed aquarium water or appropriately dechlorinated water so beneficial microbes are not exposed to untreated chlorine. Do not replace every piece of media at once unless there is a specific safety reason. The mature biofilm is part of the aquarium's life-support system.

Power cuts and equipment failure

Know how the filter restarts after a power interruption. If media remains without oxygen for a prolonged period, do not assume the bacteria are unaffected. Test ammonia and nitrite after an extended outage, restore aeration and feed lightly until the system is demonstrably stable. Keep a spare thermometer and a simple air-driven option available where practical.

Weekly maintenance without destabilising the tank

There is no single water-change percentage that fits every aquarium. Stocking, feeding, plant growth, source-water nitrate and filter capacity all matter. A lightly stocked solo Betta aquarium is still not maintenance-free; food residue, faeces and dissolved compounds accumulate even when the water looks clear.

Task	Normal rhythm	What the result tells you
Observe breathing, posture, fins and appetite	Daily	Behaviour often reveals a developing issue before a monthly test does.
Confirm temperature	Daily at first, then frequently	Detects heater drift, room-temperature effects and heatwave risk.
Remove uneaten food	After feeding when present	Prevents a small aquarium from receiving an avoidable ammonia load.
Test ammonia and nitrite	During cycling, after changes and whenever behaviour alters	Both must remain at zero in the occupied aquarium.
Test nitrate and pH trend	Regularly	Helps set an evidence-based water-change schedule.
Partial water change and substrate clean	Usually weekly, adjusted from test results	Removes waste while preserving stable temperature and chemistry.
Inspect decor and lid gaps	During maintenance	Finds new sharp edges, loose fittings and jump routes.

Match new water for temperature and treat it for chlorine or chloramine before it reaches the fish. Avoid deep-cleaning the filter, replacing substrate and making a very large chemistry change on the same day. Stagger non-urgent work so the system retains biological and environmental continuity.

Feeding a Butterfly Halfmoon Betta

FishBase records zooplankton, mosquito larvae and other insect larvae in the natural diet. Domestic Bettas do well on a complete food designed for the species, supported by appropriate frozen or live invertebrate foods. The goal is nutritional variety in controlled portions, not a constant stream of rich treats.

Food	Role	Practical use
Complete Betta granules or pellets	Reliable staple	Choose a particle the fish swallows easily and feed according to body condition, not a generic scoop.
Daphnia, brine shrimp or cyclops	Useful variety and feeding enrichment	Offer small portions from a clean source; thaw frozen food before portioning.
Bloodworm	Occasional rich food	Use as variety rather than the sole diet. Remove leftovers promptly.
Live mosquito larvae or other live food	Strong hunting response	Use only from a controlled, disease-safe source and comply with local biosecurity.
Generic tropical flake	Variable	Check that it is nutritionally complete and appropriate; some Bettas accept it, others waste it.
Human food or random meat	Unsuitable	Not balanced for the fish and can foul the aquarium.

One or two measured meals per day can work. Start with a portion the fish finishes promptly and adjust from the animal's shape, activity and water tests. A Betta's willingness to beg is not proof that it needs more food. Chronic overfeeding can cause obesity, digestive problems and declining water quality.

For a suitable dry staple, see the current Betta granulate food. Product availability changes, and one food should still be used as part of a considered diet rather than as a promise that every fish will accept the same texture immediately.

Behaviour: what is normal and what needs action?

Male Bettas patrol, pause on leaves, inspect the substrate, visit the surface and sometimes flare at a reflection or unfamiliar object. A brief flare is a display; constant exposure to a mirror or rival can become a stressor. Mirrors should never be left against the aquarium as permanent entertainment.

Observation	Possible meaning	Check next
Short flare followed by normal exploration	Territorial or investigative display	Remove persistent reflections and confirm the fish settles.
Resting on a broad leaf near the surface	Normal low-effort rest for a long-finned fish	Make sure breathing is calm and the fish remains responsive.
Continual glass surfing	Reflection, stress, barren layout or a new environment	Check water first, then lighting, background and cover.
Clamped fins and loss of appetite	General stress signal	Test water and temperature, inspect for bullying or injury, then seek a diagnosis.
Rapid breathing at the surface	Water-quality, temperature, oxygen or health problem	Test ammonia and nitrite immediately and improve gas exchange safely.
Fin tears	Sharp decor, intake damage, biting or tank-mate aggression	Remove the cause and maintain excellent water while tissue heals.

Can a male Betta live with other fish?

Compatibility depends on the individual male and the available space. A 20 litre aquarium should normally be planned as a solo Betta home, perhaps with a carefully considered snail. Community attempts need a larger aquarium because companion fish must be kept in their own proper group and because the Betta needs room to avoid them. Never squeeze a school of fish into the Betta's minimum volume.

Choose calm species that do not nip fins, do not resemble another male Betta and are comfortable at the same temperature and water chemistry. Add the Betta after the community layout is established where possible, watch every interaction and keep a cycled separation option ready. There is no species list that overrides the actual behaviour in front of you.

Potential companion	Assessment	Important condition
Another male Betta	Never	Males fight and can inflict severe injury; dividers must prevent contact, jumping and constant visual stress.
Female Betta	Not a permanent pair	Breeding introductions are specialist, temporary and closely supervised. This product is not sold as a pair.
Nerite or other suitable snail	Often possible	The Betta may still inspect or nip exposed parts; match the snail to the water and tank size.
Amano or dwarf shrimp	Uncertain	Some males ignore shrimp and others hunt them. Dense cover reduces risk but never guarantees safety.
Small peaceful shoaling fish	Possible only in a larger plan	Keep a full group in 60 litres or more where appropriate, avoid nippers and separate at the first persistent chase.
Corydoras or loaches	Not a shortcut for a nano tank	These fish need groups, suitable substrate and much more floor space than a solo Betta minimum.
Guppies and other flowing-finned fish	High risk	Appearance can trigger display or attack, while some livebearers may also harass the Betta.
Tiger barbs and known fin-nippers	Avoid	Long Halfmoon fins are vulnerable even when the Betta does not initiate conflict.

Browse the Betta collection if you are comparing forms, but remember that separate product listings do not imply that the fish can share one aquarium. A Halfmoon Mustard Betta male and a Crowntail Fancy Betta male are alternative centrepiece choices, not companions for this fish.

Why two males cannot share a tank

Male Betta splendens retain strong territorial responses even after generations of ornamental selection. Displays can escalate from flaring to biting at fins and flanks. A large tank does not make two males a safe pair, and a short period without fighting is not evidence that the risk has disappeared.

The second gallery image shows two male-form Bettas in one illustrative planted scene. It is retained as part of the protected gallery, but it must not be copied as a housing arrangement. If multiple males are kept in a divided system, each side needs sufficient volume, filtration, heat and a secure opaque visual barrier. Gaps must prevent fish from squeezing through or jumping over, and shared water can still spread disease between sections.

Fin care for a long-finned Halfmoon male

Broad fins are visually dramatic but physically delicate. Prevent injury rather than assuming every ragged edge is infection. Common causes include rough decor, a strong unguarded intake, persistent flaring at reflections and fin-nipping companions. Clean water supports healing after minor damage; medication is not the first response unless symptoms and diagnosis justify it.

Distinguishing damage from fin disease

A clean split after contact with decor can appear suddenly while the fish remains active. Progressive loss, inflamed edges, discolouration, lethargy or continuing deterioration can indicate infection or an unresolved environmental problem. Photograph the fin under the same lighting, test the water and compare change over time. Seek aquatic veterinary or experienced diagnostic help when damage advances or the fish has systemic signs.

Flow and fatigue

A Halfmoon may choose low-flow areas more often than a short-finned Betta. That preference is not laziness. Add resting levels near the surface and diffuse the return while preserving filtration. A fish that can choose between calm and gently moving water gives you better behavioural information than one forced into a single strong current.

Arrival and acclimation

Prepare the aquarium before dispatch. Temperature, filtration, ammonia, nitrite, pH and hardness should already be known. Turn down strong lighting and make sure the lid, heater guard, intake and surface route are safe before the parcel arrives.

1. Open and inspect the parcel promptly, following the arrival-evidence requirements in the published policy.
2. Keep the transport bag away from direct sun, radiators and cold draughts.
3. Follow the supplied acclimation instructions and use the guided acclimation timer as an aid rather than extending transport-water exposure without purpose.
4. Match temperature carefully and avoid an abrupt transfer across very different chemistry.
5. Move the fish without adding unnecessary transport water to the aquarium.
6. Leave the lighting low and allow the Betta to find a surface rest and cover.
7. Offer only a small meal after the fish has settled and is swimming normally.

Read the delivery and Live Arrival Guarantee policy before ordering. Eligible livestock orders are covered only when the current conditions and evidence steps are followed. The product description does not add an unqualified next-day, heat-pack or weather promise beyond that policy.

Quarantine and biosecurity without false certainty

Quarantine can reduce the chance of introducing disease to an established collection, but it must be a real life-support system: cycled, heated, covered and matched to the fish's needs. A tiny uncycled container is not protective simply because it is separate. Use dedicated nets and siphons where possible, wash hands between systems and avoid moving water or wet equipment from quarantine into the display.

There is no single empirically proven two-week or four-week home protocol that guarantees a fish is disease-free. Observation time should reflect the source, symptoms, collection value and veterinary advice. Do not medicate every new Betta prophylactically without a diagnosis; inappropriate chemicals can damage the fish and biofilter and may hide the actual cause of a problem.

Health checks and troubleshooting

Sign	Check first	Responsible next step
Refuses food	Temperature, ammonia, nitrite, recent stress and food size	Correct the environment, observe body shape and waste, and seek diagnosis if it persists.
Bloated abdomen	Portion size, constipation, scales, swimming and waste	Stop overfeeding and avoid guessing at a medicine; severe swelling needs expert assessment.
White spots	Distribution, scratching, water temperature and other fish	Confirm the likely parasite and treat the whole connected system appropriately.
Velvet-like dust or clamped fins	Lighting, breathing and skin appearance	Isolate where safe and obtain a confident diagnosis before selecting treatment.
Frayed fins	Sharp objects, intake, companions and water quality	Remove the cause; escalating tissue loss or redness may require veterinary guidance.
Lying on the bottom	Whether this is brief rest or sustained lethargy	Test water and temperature immediately if the fish is unresponsive or breathing hard.
Jumping or repeated escape attempts	Water quality, aggression, reflections and lid gaps	Correct the stressor and secure every opening.

Water quality, nutrition and environment should be investigated before disease is reduced to a visual label. Different problems can produce the same clamped fins or lethargy, and the wrong medicine can delay effective care. A fish veterinarian is the best route for severe, unexplained or worsening illness.

Breeding information is not a pair promise

Betta splendens is a bubble-nest builder. A male constructs and guards a surface nest, and a conditioned female is introduced only as part of a specialist breeding plan. Courtship can become violent, so the female requires cover and must be removed when necessary. The male then tends eggs and early larvae at the nest.

Breeding is not recommended as a casual experiment. A successful spawn can produce many young fish, and maturing males require separate secure accommodation. The keeper needs live first foods, grow-out tanks, reliable heat, water-quality control and responsible homes. This listing supplies one male and makes no claim about fertility, show genetics, colour inheritance or compatibility with a particular female.

Halfmoon compared with other male Betta forms

Form	Fin profile	Care implication
Halfmoon	Very broad caudal display with flowing dorsal and anal fins	Needs gentle flow, smooth decor and accessible surface rests.
Super Delta	Broad fan-shaped tail that does not normally reach the Halfmoon spread	Still long-finned and benefits from the same current and snag precautions.
Veiltail	Asymmetric drooping caudal with a classic flowing outline	Long fin tissue remains vulnerable to nipping and rough decor.
Crowntail	Reduced webbing exposes extended fin rays	The deliberate spiked edge should not be confused with random progressive fin loss.
Plakat	Shorter fins and a more compact swimming profile	Often handles movement more efficiently but remains territorial and needs the same water quality.
Double Tail	Caudal divided into two lobes, often with a broader dorsal fin	Body and fin conformation vary; do not assume every fish swims or develops identically.

Form should be chosen for appearance and the aquarium you can provide, not because one label is automatically healthier or friendlier. Individual behaviour remains decisive. The Butterfly Halfmoon on this page is best viewed as a long-finned solo centrepiece with specific flow and fin-care needs.

Gallery accuracy and image interpretation

The retained gallery consists of high-resolution illustrative representations based on the supplier identity reference. They are useful for showing the broad Halfmoon profile and a possible red, white, blue and dark butterfly-style pattern, but they are not documentary photographs of the individual sent. Real fish may have different colours, irregular pattern boundaries, shorter or longer rays and a different flare.

The planted backgrounds are visual scenes, not complete aquarium diagrams. A responsible setup still needs an appropriate water volume, heater, gentle filter, lid, open surface route and tested mature biofilter. The image with two males must never be used to infer that two males can coexist.

Ordering your Butterfly Halfmoon Betta male

The live selector shows current price, stock and availability. This listing is one male fish. Individual appearance varies, and no exact red, blue, white or black pattern is promised unless a selector or separately agreed actual-fish photograph explicitly says so.

New customers can use WELCOME10 for 10% off their first order, subject to the current discount terms. Eligible livestock orders are protected by the Tropical Fish Co Live Arrival Guarantee when the published conditions and arrival evidence steps are followed. Review the aquarium requirements and delivery policy before checkout so the fish moves into a prepared home.

Evidence and further reading

This listing uses scientific and welfare sources to separate observed species information from retail convention. Sources are linked for customers and search engines that need to trace the care claims:

• FishBase: Betta splendens taxonomy, range, size, water parameters, diet and biology
• Animal Welfare (2024): tank size, furnishings, behaviour and welfare
• Animal Welfare: space and environmental enrichment in Betta splendens
• University of Florida IFAS: evolution, culture and care of Betta splendens
• Open-access genomic study of domestic Betta diversity and selected traits
• Research husbandry and biosecurity review for Siamese fighting fish
• RSPCA fish welfare guidance

Older sources documenting intensive commercial holding are useful for physiology and trade history, but survival in a small production container is not the same endpoint as good long-term home welfare. Where recommendations conflict, this page gives priority to newer controlled behavioural evidence and to a furnished, stable aquarium.

Frequently asked questions

What is a Butterfly Halfmoon Betta?

It is a domestic male Betta splendens sold under two ornamental descriptors. Halfmoon refers to a broad tail display, while butterfly refers to contrasting bands or edging across the fins. Neither term creates a separate species, and individual pattern and fin spread vary.

Is the gallery the exact Betta I will receive?

No. The gallery contains illustrative representations of the commercial form. The dispatched male can differ in colour, pattern placement, fin length, ray shape and body proportions. The image showing two males is visual only and must not be copied as a housing arrangement.

What tank size does one Halfmoon Betta need?

Use at least 20 litres for one male. A furnished 25-40 litre aquarium gives a better margin for stable heat, filtration, swimming and enrichment. Research supports both adequate volume and furnishings; a tiny decorated bowl is still too limited.

What temperature is best for a Betta?

A stable 25-28°C is a practical home target. FishBase records a wider 24-30°C range, but the limits should not be treated as daily goals. Use a thermostatic heater and verify the actual water temperature with a separate thermometer.

Does a Betta need a filter?

Yes. Use mature biological filtration with gentle flow. The filter must keep ammonia and nitrite at zero while avoiding a narrow current that continually pushes the long-finned fish. A labyrinth organ allows surface breathing but does not neutralise toxic waste.

Can a Betta live in a bowl?

A bowl is not appropriate permanent housing. Small vessels restrict normal swimming and provide poor margins for stable temperature, filtration and enrichment. Controlled welfare research supports a furnished aquarium around 20 litres or larger for one male.

Can two male Bettas live together?

No. Male Betta splendens are territorial and can escalate from display to damaging bites. The paired gallery scene is illustrative, not husbandry advice. Do not use a large tank, temporary calm or visual similarity as evidence that two males are safe together.

Can this male live with a female Betta?

Not as a permanent pair. Breeding introductions are specialist, temporary and closely supervised because either fish can be injured. This listing supplies one male and does not promise a compatible pair or breeding outcome.

What fish can live with a male Betta?

Some individuals tolerate calm, non-nipping companions in a much larger, well-furnished aquarium. Others do not. A 20 litre tank should be treated as a solo setup. Any community attempt needs proper groups for the companion species, compatible water and a cycled separation plan.

What should I feed a Halfmoon Betta?

Use a complete Betta pellet or granule as a staple and add small portions of suitable frozen or live invertebrate foods such as daphnia, brine shrimp or cyclops for variety. Avoid feeding only bloodworm, overfeeding or leaving food to decay.

How do I know the aquarium is cycled?

Use tests. A mature biofilter must process the normal waste load while ammonia and nitrite remain at zero. The number of weeks since the tank was filled is not proof on its own. Complete fishless cycling before the Betta arrives.

Why is my Betta resting near the surface?

A long-finned Betta may normally rest on a broad leaf and take occasional surface breaths. Test the water promptly if resting becomes constant lethargy, breathing is rapid, fins clamp, balance changes or the fish stops eating.

Do Halfmoon Bettas need special fin care?

They need prevention: gentle flow, guarded filter intakes, smooth decor and no fin-nipping companions. If fins deteriorate, check water and physical causes before assuming infection. Progressive tissue loss, redness or systemic illness needs informed diagnosis.

Is live-fish delivery guaranteed?

Eligible livestock orders are covered by the Tropical Fish Co Live Arrival Guarantee when the current policy conditions and arrival evidence steps are followed. Read the delivery policy before ordering and inspect the parcel promptly on arrival.