Easy
Betta spl. female double tail mix
24–30°C · pH 6–7.5 · 20L
£8.99
Crowntail Female Betta is a domestic Betta splendens form with crown-like fin rays. Keep one in a mature heated 40 L+ aquarium with gentle filtration, a secure lid, open surface access and a varied high-protein diet; female sororities are not a safe default.
Betta splendens
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Crowntail Female Betta is a domestic Betta splendens form with crown-like fin rays. Keep one in a mature heated 40 L+ aquarium with gentle filtration, a secure lid, open surface access and a varied high-protein diet; female sororities are not a safe default.
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–8 · 20L
The betta fish is one of the most popular and most misunderstood freshwater species. This guide covers everything from proper tank size to the truth about tank mates.
Maintain these water conditions for optimal health and vibrant colors
Crowntail Female Betta (Betta splendens) is a domestic form of the Siamese fighting fish, selected for reduced webbing between the fin rays that creates the characteristic crown-like edge. Crowntail describes finnage, not a separate species. Female describes the listed sex, but it does not guarantee a peaceful personality or make cohabitation with other Bettas automatically safe.
A single female is the responsible default plan. Give her a heated, filtered and fully cycled aquarium with gentle flow, a secure lid, open access to the surface and plenty of planted cover. She can be active and interactive without the very long fins of some male forms, yet she still needs warm stable water, deliberate feeding and daily observation.
| Accepted scientific name | Betta splendens Regan, 1910 |
|---|---|
| Domestic form | Crowntail female |
| Family | Osphronemidae |
| Species range | Mekong basin in Southeast Asia; this listing is a domestic aquarium form |
| Published adult size | Up to 6.5 cm total length for male/unsexed fish |
| Practical aquarium | 40 L+ for one; longer footprint preferred |
| Practical temperature | 25-28 C; FishBase publishes 24-30 C |
| Practical pH | 6.5-7.5; published range 6.0-8.0 |
| Practical hardness | 5-15 dGH; published range 5-19 dH |
| Temperament | Individual and territorial; solitary care is safest |
| Diet | Quality Betta pellets plus varied small frozen or trusted live invertebrate foods |
| Breathing | Facultative air breather; unobstructed surface access is essential |
The practical targets provide a stable middle ground rather than redefining the species. Ammonia and nitrite must remain at zero. Use measured water preparation and avoid sudden changes merely to reach a precise pH.
In Crowntail Bettas, the membrane between fin rays is reduced so the rays extend beyond the webbing. The result can resemble points or a crown around the tail, dorsal and anal fins. The exact reduction, symmetry and colour vary between individuals, especially in mixed domestic lines.
Exposed ray tips are not automatically fin rot. Healthy Crowntail edges follow a reasonably consistent ray pattern without inflamed tissue, progressive loss or dark melting margins. Ragged damage appears irregular, may worsen over days and is often accompanied by stress, clamping or water-quality problems.
| Feature | Normal Crowntail trait | Possible damage |
|---|---|---|
| Fin-ray extension | Repeated structured points around the fin edge | Random missing sections or sudden shortening |
| Fin membrane | Evenly reduced between rays | Progressive erosion, redness or opaque margins |
| Posture | Fins open during exploration and display | Persistent clamping with lethargy |
| Change over time | Stable pattern | Visible deterioration between photographs |
Take photographs from a similar angle after settling and during routine checks. A stable record is more useful than trying to memorise every point on a moving fish.
Female domestic Bettas often have shorter fins and a fuller body than long-finned males, but sex cannot be inferred from fin length alone. Some females develop strong colour and extended fins, while young males can look short-finned. This listing is sold as female, but no promise is made about temperament, breeding readiness or compatibility with another individual.
An egg spot can support sex assessment, but it is not infallible in juveniles or stressed fish. Behaviour such as flaring also occurs in both sexes. If breeding or a communal female project depends on certainty, observe maturity and keep independent accommodation ready.
FishBase records Betta splendens from the Mekong basin and describes standing waters, floodplains, canals and rice-paddy habitats as well as larger rivers. Wild ecology helps explain the need for warm water, vegetation, surface access and a diet rich in small animal foods. It does not mean a domestic Crowntail should live in an unfiltered cup or stagnant bowl.
Domestic lines have been selected for colour, fins and behaviour over many generations. This fish should not be marketed as wild or locality-specific. Its aquarium should combine stable modern filtration with calm planted shelter rather than imitate polluted or oxygen-poor water.
The size selector describes approximate dispatch length, not final size. A 2-3 cm juvenile needs finer food, protected filter intakes and close body-condition monitoring. A 3-4 cm fish still needs the same adult aquarium and gradual acclimation. The larger option is not a guarantee of calmer behaviour or stronger colour.
Live measurements are approximate because the fish does not hold still against a ruler. Natural variation within one size band is expected. Choose by the aquarium you can provide, not by what fits a temporary container.
Use 40 litres or more for one female as the practical plan here. A longer footprint provides exploration space, planting zones and a gentle flow gradient. Larger volume also slows temperature and waste swings, although it does not replace cycling or maintenance.
Tiny bowls and one-gallon containers are unsuitable. They are difficult to heat and filter safely, accumulate waste quickly and offer no behavioural choice. A vase with a plant root does not provide oxygen, nutrition or stable water.
Use the tank-volume tool to calculate actual filled volume after substrate and decor. Measure internal dimensions and leave a warm air gap beneath the secure lid so the fish can reach the surface without jumping out.
The cycle tracker can organise test results. Bottled bacteria may support cycling, but a label cannot prove that the filter is ready to process the fish's waste.
Select an adjustable thermostatic heater rated for the aquarium volume and room conditions. A very small preset heater may fail to hold temperature through a cold night, while an oversized unguarded unit can create local hot spots or overheat rapidly if its thermostat fails. Position the heater where filtered water moves gently past it and the fish cannot become trapped behind it.
Use a separate thermometer at the opposite end of the aquarium. Check it daily and after water changes. A heater light only shows that the unit is powered; it does not prove the water has reached the correct temperature.
For filtration, choose mature biological capacity with controllable flow. Sponge filters are gentle and fry-safe, while internal or external filters can work with an intake guard and baffled outlet. Observe the fish, not only the manufacturer's flow rating. If she is pushed away from food, cannot rest or avoids half the aquarium, the current is too strong.
| Equipment | What it must achieve | Failure to avoid |
|---|---|---|
| Heater | Stable 25-28 C | Unverified preset temperature or exposed hot surface |
| Thermometer | Independent daily reading | Placed directly beside the heater only |
| Filter | Mature biological processing | High current chosen only from turnover numbers |
| Intake guard | Protects fins and fish | Reducing flow so far that waste accumulates |
| Air stone | Optional extra gas exchange | Treating bubbles as a cure for ammonia |
Live or silk plants can create resting areas and break reflections. Broad leaves close to the surface are useful because Bettas often rest near air access. Avoid hard plastic plants or sharp ornaments that can catch the extended Crowntail rays.
Wood, smooth caves and floating cover can provide security, but keep enough open surface for breathing and feeding. Rinse new decor, make heavy structures stable and inspect every opening so the fish cannot become trapped.
| Feature | Benefit | Safety check |
|---|---|---|
| Broad-leaved plants | Resting and cover | No sharp or decaying leaves against the fish |
| Floating plants | Shade and surface security | Do not block the entire surface |
| Wood | Visual structure | Sand rough points and avoid trapping gaps |
| Cave | Retreat | Entrance must be smooth and large enough to turn |
| Secure lid | Prevents jumping | Maintain a warm humid air space and equipment openings that cannot be escaped through |
Maintain a practical 25-28 C. FishBase publishes 24-30 C, but the extremes leave less margin for heater error, oxygen reduction or cold stress. Use an adjustable heater sized for the aquarium and verify it with an independent thermometer.
Low temperature can reduce activity, appetite and immune function. Excess heat accelerates metabolism while reducing dissolved oxygen. Do not respond to a wrong reading with a sudden hot or cold water change; correct temperature gradually and investigate the heater.
| Reading | Assessment | Response |
|---|---|---|
| 25-28 C stable | Practical routine range | Continue daily checks |
| Below 24 C | Too cool for routine care | Check heater and raise gradually |
| 29-30 C | Upper published range with less oxygen margin | Increase safe aeration and identify heat source |
| Above 30 C | Overheating risk | Begin controlled cooling without abrupt shock |
A practical target is pH 6.5-7.5 and 5-15 dGH, within the wider published pH 6.0-8.0 and 5-19 dH. Stability and clean water matter more than chasing one perfect midpoint. Compare source water with the water matcher before choosing a preparation method.
Ammonia and nitrite must remain zero. Control nitrate through stocking, measured feeding and partial water changes. Dechlorinate tap water and match replacement temperature. Do not replace all aquarium water or clean all mature filter media at once.
A sponge filter or baffled internal/external filter can provide biological capacity without forcing the fish to fight a current. Long or pointed fins increase drag. Watch whether the fish can rest and feed without being pushed across the aquarium.
Betta splendens is a facultative air breather using a labyrinth organ. Surface visits are normal, and access must never be blocked. Air breathing does not make poor oxygen or dirty water acceptable. Repeated frantic gulping, rapid gill movement or inability to leave the surface requires immediate checks.
Surface agitation should support gas exchange without turning the tank into fast water. Position plants and decor to create calm areas, but avoid completely stagnant corners where debris accumulates.
Start with weekly partial water changes and adjust from test results, aquarium volume and feeding. Siphon visible debris from open areas while avoiding major disruption to planted roots and resting sites.
Soap, household spray and cleaning residue must stay away from aquarium equipment. Use dedicated buckets and tools. Large simultaneous changes to filter, substrate and chemistry create avoidable instability.
Daily care can be brief but should be observant. Check the thermometer, filter flow, surface route and lid before feeding. Watch the fish approach food, swallow normally and return to exploration. Count surface breaths only when behaviour has clearly changed; occasional air intake is expected.
Remove uneaten food and dead plant leaves. Look along the body for raised scales, white spots, gold dusting or unusual swelling, then compare the Crowntail edges with the previous photograph. A problem detected while appetite remains strong is easier to investigate than one noticed after several days of decline.
Do not wait for an annual deep clean. Regular small maintenance protects biological stability and makes it easier to understand what changed when behaviour shifts.
FishBase records zooplankton, mosquitoes and other insect larvae in the species diet. In captivity, use a high-quality Betta pellet or small carnivore granule as the measured base, then rotate frozen or trusted live foods such as daphnia, cyclops, brine shrimp and suitable bloodworm.
| Food | Role | How to use it |
|---|---|---|
| Complete Betta pellet | Regular nutritional base | Choose a small particle and feed measured portions |
| Frozen daphnia or cyclops | Variety and small-invertebrate profile | Rotate thawed portions |
| Brine shrimp | Conditioning and enrichment | Use as part of a varied diet |
| Bloodworm | Occasional rich food | Do not make it the only staple |
| Trusted live food | Natural hunting behaviour | Use only from a reliable clean source |
| Plant roots or community leftovers | Not a diet | Feed the fish intentionally every day |
Feed adults once or twice daily in small portions. Watch each item being swallowed and remove leftovers. One fixed pellet number cannot suit every brand because sizes and densities differ. A weekly fast is not a substitute for correct daily portions.
A healthy fish should maintain an even body profile without a persistent hollow abdomen or chronic swelling. Photograph from the side and above monthly. Slow weight change can be masked by fins and colour.
If the fish spits food, try a smaller appropriate particle and inspect the mouth. Persistent refusal requires water testing and health assessment. Sudden swelling, pineconing scales, abnormal faeces or loss of balance needs prompt investigation rather than repeated feeding.
Female Bettas can be territorial and may injure one another. Keeping two is particularly risky because one fish can focus all aggression on the other. Three can create the same problem with one target. Sex does not remove the species' fighting behaviour.
One female in her own planted aquarium offers reliable welfare and does not deprive her of required social contact. Bettas do not need a Betta companion to be healthy. Interaction with the environment and keeper, varied feeding and appropriate cover provide enrichment without forcing cohabitation.
A sorority is a high-risk communal female setup, not a standard recommendation. Even a large planted aquarium and a group introduced together cannot guarantee safety. Aggression can appear immediately or after weeks when fish mature, territories shift or one individual becomes weak.
A specialist attempting one needs a large aquarium, dense sight-line barriers, independently quarantined females of suitable size, continuous observation and a separate heated cycled aquarium for every fish that must be removed. A group-size formula does not make it safe. This listing does not recommend buying several females simply to meet a supposed minimum.
| Plan | Assessment | Reason |
|---|---|---|
| One female | Recommended default | Predictable territory and easiest health monitoring |
| Two females | Avoid | One fish may receive continuous aggression |
| Three females | Avoid | A weak individual can still become the fixed target |
| Sorority group | Specialist high-risk project | Needs substantial space, barriers, observation and individual backup tanks |
Failure is not limited to visible fighting. One fish may control the warmest resting place, feeding zone or surface route while another remains hidden and slowly loses weight. Torn fins are a late sign. Colour loss, horizontal stress stripes, clamping, rapid breathing and refusal to leave cover all matter.
| Sign | Why it matters | Action |
|---|---|---|
| One fish always hides at feeding time | She may be excluded before direct attack is seen | Separate and assess body condition |
| Repeated chasing across the full tank | No usable refuge remains | End the cohabitation rather than adding more decor around an injured fish |
| Fin damage on several fish | Aggression is established | Separate individuals and treat environmental causes |
| Group was calm, then changes suddenly | Maturity, illness or territory can reset hierarchy | Use backup tanks immediately |
| One fish grows while another thins | Feeding access is unequal | Do not solve by adding excess food to the shared tank |
Removing only the most aggressive fish does not guarantee the remaining hierarchy will be stable; another individual may take its place. The humane success criterion is every fish feeding, resting and moving without chronic pressure, not merely the absence of death.
Some females tolerate carefully selected companions in a 60-litre-plus aquarium, while others attack or are stressed by them. Use the tank-mates tool as an initial check, then make the decision from the individual fish and actual layout.
Peaceful small shoaling fish or bottom dwellers may be possible where temperature and water match, but avoid fin-nippers, large aggressive fish, territorial gouramis, flashy guppies and any male Betta. Shrimp may be hunted; snails are often tolerated but antennae can be nipped.
Introduce companions only after quarantine and provide enough space that the Betta cannot patrol the entire aquarium continuously. Have a cycled separation tank ready before testing compatibility.
Examples show the reasoning process rather than promise compatibility. Individual Bettas vary, and any community may need to be dismantled.
One female in a 40-litre-plus planted aquarium is the most predictable plan. Snails may be possible after observation. The fish has the whole layout without social pressure, and appetite or fin changes are easy to detect.
In a mature 60-litre-plus long aquarium, a tolerant individual may share with a restrained shoal of peaceful small fish that do not nip fins or dominate the surface. Add the Betta with a separation plan and monitor feeding at more than one level.
Small Corydoras or kuhli loaches are sometimes suggested, but they require their own groups, floor area and foods. A 40-litre Betta tank is not automatically large enough for them. Increase the footprint and judge the complete adult stocking plan.
Some individuals ignore adult shrimp; others hunt them actively. Shrimplets are especially vulnerable. Dense moss can reduce losses but cannot make the fish shrimp-safe. Do not use valuable breeding shrimp to test personality.
Rearrange a small piece of safe decor occasionally, rotate food textures and allow the fish to investigate floating cover or smooth tunnels. Simple target training can support inspection and controlled feeding. Enrichment should create choice, not force constant activity.
A mirror can trigger display but also a stress response. If used at all, keep exposure brief and infrequent, remove it if the fish remains agitated and never leave a reflective panel as permanent entertainment. Check glass reflections from room lighting before assuming the fish is reacting to an invisible tank mate.
Rest is normal. Bettas often lie on leaves, wood or substrate for short periods. Concern increases when resting is accompanied by rapid breathing, clamped fins, loss of appetite or inability to reach the surface.
A settled female explores, rests on leaves, approaches food and uses the full aquarium without frantic pacing. Brief flaring at a reflection can occur. Constant glass surfing, hiding, clamped fins, colour loss, refusal to eat or repeated attacks indicate a problem.
Check reflections, flow, water, temperature, cover and tank mates. Do not label persistent stress as a quirky personality. Individual behaviour can change with maturity, illness or a rearranged territory.
Jumping can be normal escape behaviour in this species, which is why every aquarium needs a secure lid. A sudden increase can also indicate ammonia, unsuitable temperature, aggression or disturbance. Check the environment rather than simply lowering the water and ignoring the cause.
Glass surfing may occur briefly after arrival. Persistent pacing can result from reflection, exposure, strong flow or an aquarium with no secure resting zone. Add visual cover, adjust room lighting and test water. Do not tape an opaque sheet across every panel without preserving enough observation and day-night cues.
Flaring at a reflection is different from calm exploration. Continued display uses energy and can damage fins against decor. Change the light angle, background or nearby reflective objects when it becomes repetitive.
Betta splendens is a bubble-nest builder, with the male guarding the nest and eggs. A male and female are not a permanent pair. Breeding introductions can involve intense chasing and injury, and the female is normally removed after spawning.
Breeding requires conditioned mature fish, separate heated aquariums, gentle water, a protected nest area and a plan for many juveniles that must later be separated by sex and aggression. Do not add a male to the display aquarium to see whether they get along.
Crowntail inheritance and fin quality are complex. This listing does not guarantee genetics or breeding outcomes. Welfare and suitable homes for offspring must be planned before spawning.
Healthy fins keep their structured Crowntail form without progressive loss. Warning signs include rapidly receding membrane, red or black inflamed margins, fuzzy growth, white spots, gold dusting, clamping, rapid breathing, swelling or persistent lethargy.
Test water before medication. Ammonia, nitrite, excessive flow, sharp decor, cold water and tank-mate damage can create or worsen fin problems. Correct environmental causes safely and seek an informed diagnosis. Do not mix treatments without evidence that the combination is appropriate.
Quarantine new fish in a heated, filtered, fully cycled aquarium with a lid and surface access. Use separate nets and siphons where possible. Verify feeding, skin, fins, breathing and faeces before introducing community companions.
Minor clean tears may regrow when water is excellent and the cause has been removed. The new edge can look clear before colour returns. Photograph progress and avoid repeated netting simply to inspect it.
Fin rot is a description of deterioration, not one diagnosis. Bacterial involvement, water quality, injury and stress can overlap. If tissue continues to recede, the fish becomes lethargic or the edge is inflamed, seek an informed diagnosis. Adding random medication while leaving sharp decor or ammonia in place will not solve the underlying problem.
| Trend | Interpretation | Response |
|---|---|---|
| Clean tear, stable edge, normal appetite | Mechanical injury may be healing | Remove cause and maintain clean stable water |
| Clear smooth new margin | Possible regrowth | Continue observation |
| Edge recedes day by day | Active damage or infection | Test water and seek diagnosis promptly |
| Repeated new tears | Decor, intake or tank-mate problem remains | Inspect the full environment |
Rapid breathing, loss of balance, repeated frantic surfacing, sudden clamping or collapse across multiple fish demands immediate checks of ammonia, nitrite, temperature, oxygenation, filter operation and recent chemical exposure. Increase safe aeration and prepare matched dechlorinated water while identifying the cause.
When only this fish is affected, compare body condition, skin, fins, faeces and appetite. A hospital aquarium must be heated, cycled and covered; an unheated unfiltered container can worsen the problem.
During a heatwave, measure the aquarium rather than the room. Reduce unnecessary lighting heat, improve safe surface movement and feed conservatively. A fan can cool through evaporation, but it increases water loss; top up correctly and remember that minerals remain behind.
Do not add loose ice or make a sudden cold water change. High temperature and low oxygen often occur together, so monitor breathing. Keep the lid secure even while improving ventilation.
During a power cut, stop feeding, preserve filter media in aquarium water and use battery aeration if available. After a prolonged outage, stagnant water in a closed external filter may be foul; assess it before sending it back into the aquarium. Monitor ammonia and nitrite after restart because biological capacity may have fallen.
Prepare the aquarium before delivery. Dim the lights, confirm heater and filter operation, and check water chemistry. Follow the supplied acclimation instructions and do not pour transport water into the aquarium.
Release near calm cover with a clear surface route. Offer a small meal after settling and remove leftovers. Watch for normal surface breaths versus repeated distress, and inspect the Crowntail edges over the following days.
Use the acclimation timer to organise the process. Review packing, eligible routes and claim requirements on the live-fish delivery page.
The Betta collection includes domestic and wild-type species with very different behaviour. A Crowntail should not be chosen solely for fin shape. Compare the shorter-finned Halfmoon Plakat Male Betta, Double Tail Male Betta and Double Tail Female Betta.
For another short-finned female form, see the Plakat Koi Female Betta. Male products require solitary male planning and must not be used as companions for this fish.
This listing suits a keeper who can provide one female with a mature 40 L+ heated aquarium, gentle filtration, a lid, surface access and a high-protein varied diet. It is a poor fit for a bowl, unheated vase, uncycled tank or an owner expecting several females to live together automatically.
Before ordering, confirm actual volume, temperature, water chemistry, filter maturity, lid security and a quarantine plan. If tank mates are intended, use a larger aquarium and prepare separation before the first introduction.
Use 40 litres or more as the practical plan, with a longer footprint, heater, mature gentle filter, plants and a secure lid.
Maintain 25-28 C for routine care. FishBase publishes 24-30 C, but the extremes leave less safety margin.
Do not plan a pair. One fish can focus continuous aggression on the other, so separate solitary aquariums are safer.
No group size guarantees safety. Sororities are specialist, high-risk projects requiring substantial space, barriers, constant observation and individual backup tanks.
No. Reduced webbing creates regular extended rays. Random progressive erosion, redness or missing tissue may indicate injury or disease.
No. A male is not a permanent companion. Breeding introductions are temporary specialist procedures and can cause serious injury.
Use quality Betta pellets with varied frozen or trusted live daphnia, cyclops, brine shrimp and occasional bloodworm.
Bettas are facultative air breathers, so regular surface breaths are normal. Frantic repeated gulping with rapid breathing requires immediate water, temperature and oxygen checks.
She may hunt shrimp or shrimplets. Dense cover helps, but compatibility cannot be guaranteed.
Yes for a prepared beginner who cycles the aquarium, provides heat and filtration, keeps her singly and monitors water and fins.
The Betta frozen-food cubes can add variety when portioned appropriately; they do not replace a balanced feeding plan. Browse the labyrinth-fish category to compare other air-breathing species without assuming identical compatibility.
