Big Ear Plakat Male Betta Mix (Betta splendens)

Choose a territorial male Betta for a dedicated aquarium

The Big Ear Plakat Male Betta Mix is an ornamental Betta splendens, a labyrinth fish in the family Osphronemidae. The wild species occurs in Asia’s Mekong basin, and FishBase records a maximum length of 6.5 cm. This male suits a careful keeper who can prepare a mature, heated and gently filtered aquarium, test the water and provide a dedicated territory.

“Big ear” refers to the form’s enlarged pectoral fins, while “plakat” is the trade term for a short-finned form. Domestic Bettas vary widely in colour and finnage, so use those words to understand the intended form rather than expecting one fixed pattern.

This is a territorial fish with a specialised organ that lets it take atmospheric air at the surface. That ability never replaces filtration, heating or clean water. It means the aquarium must combine a secure cover with clear surface access and a small air space beneath the lid.

FishBase places Betta splendens in the family Osphronemidae, while NCBI Taxonomy also lists the accepted scientific name. FishBase records the wild species in standing waters, floodplains, canals, rice paddies and rivers. Its wild diet includes zooplankton, mosquitoes and other insect larvae. These details explain the value of calm flow, cover and small animal-based foods, while the domestic aquarium routine below uses dedicated husbandry guidance.

Our care assessment is intermediate. A careful first-time keeper can succeed, but only after preparing a mature aquarium, learning to test water and accepting that a male normally needs his own territory. For the complete background to those decisions, read our Betta Fish Care Guide.

Understand the animal, offer and gallery

What one purchase means

One purchase supplies one animal. Plan the aquarium around the adult measurements.

Sex is guaranteed only when the exact product or selected option explicitly states male or female. This Big Ear Plakat Male Betta Mix listing is sold as male.

How to read the gallery

The gallery images are representative illustrations of this type of animal, not photographs of the animal supplied, so pattern and colours can differ from the live animal.

The illustrations show red and purple Bettas with enlarged pale pectoral fins, but they also show long, flowing red-and-white fins. Because the intended form is plakat, do not use the illustrated fin length as a guarantee of the live animal’s outline. Domestic colour, fin and body traits are highly diverse; research into domestic Betta diversity also shows why appearance should not be used to infer origin, age, temperament or welfare.

If you are comparing ornamental forms rather than preparing the aquarium, browse our Betta collection. Keep the husbandry decision separate from the colour decision: every candidate still needs a heated, filtered, covered and furnished aquarium.

Plan around the adult size, water and space needs

Seriously Fish gives Betta splendens a length reference of 70 mm standard length and an aquarium base of 45 × 30 cm, equivalent to about 41 litres, for a single male or pair. FishBase records a maximum of 6.5 cm total length, which is the adult figure used throughout this listing. Plan the aquarium around 6.5 cm rather than the fish’s size at dispatch.

Our starting minimum is at least 20 litres for one male, following the store’s Betta policy and OATA’s UK recommendation. When choosing a new aquarium, the 45 × 30 cm, roughly 41-litre species reference gives more room for planting, refuges and a gentle filter. Check internal dimensions and real filled volume because substrate, wood and an air gap reduce usable water.

OATA’s broad guidance covers Bettas as a group: it gives 20–28°C, pH 6.0–8.0 and 4–12 dGH for tank-reared fish. Seriously Fish gives the species 22–30°C, pH 6.0–8.0 and 1–15 dGH. Tropical Fish Co uses a stable 26–28°C routine target for a typical domestic Betta splendens, keeping that target inside both published temperature ranges.

Prepare the aquarium before the fish arrives

Start with an aquarium of at least 20 litres, then choose more space where practical. A rectangular footprint makes it easier to arrange cover, open swimming room and surface access than a narrow container with the same nominal volume. If you are buying a new setup, compare it with the 45 × 30 cm and roughly 41-litre reference rather than treating 20 litres as an ideal ceiling.

Pass this preparation gate

• Mature biological filter: establish it before adding the fish and confirm that it processes waste.
• Thermostatic heater: choose equipment rated for the aquarium and room conditions.
• Separate thermometer: measure the water instead of relying only on the heater setting.
• Secure lid: reduce escape risk while leaving an air space and clear access to the surface.
• Gentle flow: diffuse the outlet so the fish can swim and rest without being swept away.
• Safe cover: add plants or smooth refuges and remove rough edges, tight holes and traps.
• Water tests: confirm zero ammonia and zero nitrite before the planned arrival.

A new tank can look clear while lacking enough beneficial bacteria to process ammonia. Follow our first tropical aquarium preparation guide before adding livestock. Record the test results rather than judging maturity from water clarity or elapsed time alone.

Rehearse the finished setup

Run the heater, filter and thermometer together before choosing the fish. Check the temperature in the morning and evening, then compare the readings. A steady result shows that the heater, aquarium volume and room conditions are working together; a changing result means the cause should be found before livestock enters the tank.

Test the lid around every cable and airline. The cover should sit securely without closing the route to atmospheric air. Move floating plants aside if they block the whole surface, and confirm that the filter outlet does not force the plants into one solid mat.

Place one refuge in a calm area and leave an open route between it, the feeding area and the surface. Watch a small piece of floating food or plant debris to see how the current travels. If it races around the aquarium or becomes trapped against the glass, redirect or diffuse the outlet while keeping the filter running.

Finish by checking maintenance access. You should be able to reach the heater, filter, substrate and water-change areas without dismantling every refuge. A layout that can be maintained gently is safer than an elaborate arrangement that requires a major disturbance each week.

Hold stable water within the working ranges

Set a typical domestic Betta splendens aquarium to a stable 26–28°C. Measure it with a separate thermometer at a consistent time of day and check again after cold nights, warm weather, maintenance or equipment changes. Do not make rapid adjustments simply to reach the middle of a range.

Keep pH between 6.0 and 8.0 and general hardness between 4 and 12 dGH. These working values sit inside the wider species parameters. Test the water that actually enters the aquarium because UK tap supplies differ, and domestic softeners or treatment devices can alter the result.

Use conditioner on replacement tap water to deal with chlorine or chloramine. Match replacement water carefully enough to avoid abrupt temperature or chemistry changes. Our water chemistry guide explains what each reading means, while the water matcher helps compare your measured aquarium values with these working ranges.

Work from trends rather than isolated numbers

Suppose the aquarium remains at 27°C for several days and then reads 25°C after a cold night. Check the room temperature, heater indicator, thermometer position and water circulation before changing the thermostat. The goal is to identify why the reading moved, then restore the planned range gradually without creating a second swing.

If pH changes after a water change, compare the aquarium with the conditioned replacement water. A mismatch points to the water source or preparation method; a continuing change inside the aquarium calls for a review of decor, accumulated waste and maintenance. Avoid repeatedly adding products before understanding which part of the routine changed.

Use a written log during the first month. Record temperature, ammonia, nitrite, nitrate and pH on the same days and note water changes, filter work and feeding changes beside the results. Patterns become easier to recognise when a number can be linked to an action.

A stable reading near one end of the range is preferable to repeatedly changing the aquarium in pursuit of a fashionable decimal. The fish, filter and plants all benefit from predictable conditions.

Protect the biological filter with a measured routine

RSPCA aquarium guidance explains that biological filtration converts toxic ammonia to nitrite and then to safer nitrate. The filter therefore remains essential even though a Betta can breathe atmospheric air. Turning it off or repeatedly sterilising the media removes the system that processes the fish’s waste.

Weekly routine

1. Measure temperature, ammonia, nitrite, nitrate and pH before maintenance so the results show what has accumulated.
2. At least once every week, change about 25% of the water, following OATA’s Betta guidance.
3. Use a siphon to remove settled waste from accessible areas without dismantling every refuge.
4. Treat replacement tap water before it enters the aquarium.
5. Check the filter inlet, outlet and media for reduced flow or blockages.
6. Record unusual readings, feeding changes and equipment adjustments.

If the filter needs cleaning, rinse the media lightly in aquarium water removed during the water change. Do not run it under the tap because any chlorine or chloramine present may kill the beneficial bacterial population established in the media. Clean only as much as required to restore flow; sparkling media is not the goal.

Use nitrate as a trend as well as a single number. OATA advises keeping it no more than 20 mg/L above the normal tap-water level. A rising trend can point to excessive feeding, accumulated waste, insufficient water changes or more biological load than the routine can manage.

Separate routine cleaning from fault finding

A normal weekly water change should be predictable and limited. Remove the planned amount of water, siphon accessible debris, treat the replacement water and confirm that the equipment restarts. Avoid combining a large water change, complete filter clean and full rearrangement unless a specific problem makes that necessary.

If flow falls, inspect the easiest causes first: a blocked intake, trapped plant material, a kinked airline or debris around the outlet. Restore circulation with the smallest intervention that works. Opening every chamber and replacing all media at once can remove useful bacteria without addressing the original blockage.

If ammonia or nitrite appears, pause any plan to add animals. Check for uneaten food, decaying matter, interrupted power, clogged media or a recent deep clean. Correct the cause while protecting the remaining bacterial colony.

Shape the aquarium around cover, gentle flow and surface access

A well-planted, shaded aquarium gives this fish places to explore and rest. Seriously Fish recommends tall stems, floating plants, tropical lilies, Cryptocoryne, driftwood and plants such as Microsorum or Taxiphyllum. These are options rather than a compulsory shopping list; choose aquarium-safe plants that suit your lighting and water.

Leave open routes between refuges and a clear path to the surface. Floating cover can create shade, but it must not seal the whole surface. Fit the lid securely above a small air space so the fish can breathe atmospheric air without creating an escape route.

Adjust the current by watching the fish

Seriously Fish suggests an 80–125 litres-per-hour filter for its roughly 41-litre setup. Treat that as equipment guidance for that aquarium scale, not a fixed rate for every tank. Layout, outlet design and the individual fish determine how forceful a stated turnover feels.

Build three useful zones

Create a sheltered resting zone away from the strongest current, an open route for swimming and feeding, and an unobstructed surface area. These zones can overlap, but each must remain usable after plants grow. Check them from the fish’s level rather than only from above.

For example, tall stems can screen the filter side, wood can hold attached plants lower in the aquarium, and floating growth can shade part of the surface. Leave a clear channel between the resting area and open air. If the only path passes directly through the filter jet, redirect the outlet or move the refuge.

Inspect every opening before installation. The fish should not need to squeeze through a tight hole, brush against a rough edge or enter a cavity that cannot be checked. Smooth plant pots or suitable pipe sections can provide shelter, but position them so waste can be removed and the fish cannot become trapped.

Dried leaf litter may add cover and support microbe colonies as it decomposes, but monitor it as part of the aquarium’s waste load. Remove material that is fouling the water or obstructing flow. Recheck the layout during each water change because plants, leaves and floating cover move over time.

Feed complete food first and measured variety second

Use a suitably sized complete Betta pellet or quality aquarium flake as the nutritional base. OATA recommends feeding only what the fish can eat within a few minutes, once a day. Observe the food as it is eaten and remove leftovers before they decompose.

Offer small live or frozen foods such as daphnia or bloodworm as variety. Seriously Fish also lists Artemia, chironomid larvae, small crickets and fruit flies, while warning that Bettas can be prone to obesity. Variety supports condition, but a treat should not replace the balanced staple.

Make the portion fit the food

• Follow the manufacturer’s directions for the exact complete food.
• Reduce the offered amount if pieces remain after a few minutes.
• Choose pieces the fish can take without repeatedly spitting them out.
• Watch body condition over time rather than relying on begging behaviour.
• Pre-measure portions when more than one person feeds the aquarium.
• Review feeding whenever nitrate rises or debris accumulates quickly.

A fixed pellet count is unreliable because pellet dimensions and energy density differ between brands. The size of the fish’s eye is also not a dependable portion formula. Use prompt consumption, body condition and water-quality trends together.

Adjust one variable at a time

If a new pellet is larger than the previous food, do not copy the old piece count. Begin with the manufacturer’s directions, watch how quickly each piece is swallowed and stop when the measured meal has been consumed. Record the product and portion so another carer can repeat the same routine.

When frozen food is used as variety, separate a suitably small amount and avoid allowing thawing liquid or unused food to accumulate in the aquarium. Return to the complete staple at the next routine feed rather than letting a preferred treat become the whole diet.

If appetite falls, check temperature, ammonia, nitrite, recent maintenance and the fish’s breathing or posture before offering richer food. A sudden feeding change can be an early system warning. Remove uneaten food and continue observing rather than adding repeated meals to test the appetite.

Acclimatise slowly and watch the first week

Have the aquarium heated, filtered and tested before the delivery window. Arrange for someone to receive live fish so the parcel is not left unattended. Read the current delivery and Live Arrival Guarantee policy before the delivery date because it contains the claim steps and timing that apply to the order.

On arrival

1. Start filming before the sealed parcel is opened and record continuously as it is opened, with the fish still inside the sealed bag before anything is disturbed.
2. Open and inspect the parcel on the day it arrives.
3. Float the bag for 20–30 minutes before releasing the fish.
4. Never pour the bag water into the aquarium.

First-week checkpoints

Keep the observations comparable

Look at the fish at similar times each day and record only clear changes. Note whether it reaches the surface freely, holds a steady position away from the outlet, uses cover and responds at the planned feeding time. Consistent observations make a developing change easier to distinguish from a single unfamiliar movement.

Check the equipment before assuming the fish is the only variable. Confirm the heater indicator, actual thermometer reading, filter flow and lid position. Test ammonia and nitrite whenever behaviour changes rather than waiting for the next scheduled maintenance day.

Do not introduce another animal during this settling period. A stable, lightly disturbed first week makes changes easier to recognise and avoids increasing the filter’s load while the new fish establishes its routine.

Respond to health changes in the right order

Learn the individual fish’s normal appetite, breathing, posture, colour, swimming pattern and resting places. A change from that baseline is more useful than comparing one movement with a generic symptom list. OATA highlights hanging at the surface, sitting on the bottom, erratic swimming, altered colour, hiding, changed aggression, unusual gill movement, damaged fins, white spots, fluffy growths and reduced feeding as signs that deserve investigation.

Check the system before choosing a treatment

1. Confirm temperature with the separate thermometer.
2. Test ammonia, nitrite, nitrate and pH.
3. Inspect the heater, filter flow and recent power interruptions.
4. Review feeding, water changes, new decor and any recent additions.
5. Compare the fish’s current breathing, posture, appetite and fins with its normal pattern.
6. Avoid combining medicines or changing temperature from a visual guess.

The MSD Veterinary Manual’s aquarium-fish guidance supports investigating aquarium history and water quality as part of diagnosis. A white mark, torn fin, swollen abdomen or unusual swimming pattern can have several causes, so one visible sign should not decide the medicine.

Record the sequence clearly

Write down when the change began, the current water readings and anything that changed beforehand. Include filter cleaning, a missed water change, new food, moved decor, a power cut or unusual room temperature. This sequence helps distinguish a continuing system problem from a brief response to maintenance.

Correct dangerous water conditions promptly but gradually enough to avoid creating another abrupt change. Keep notes on readings, behaviour and actions. When signs are severe, persistent or unexplained, use OATA’s fish-vet directory to locate qualified help.

Occasional surface breathing is normal for a labyrinth fish. Repeated distress at the surface alongside rapid gill movement, poor balance or abnormal water tests requires immediate investigation of the whole aquarium.

Make solitary housing the default

Keep one male Betta splendens per aquarium. FishBase states that males fight each other, while Seriously Fish says ornamental strains are generally best kept alone and that only a single individual can be maintained per tank in most cases. More space or extra planting does not turn direct male cohabitation into a safe plan.

Avoid another male Betta and avoid fish with a similar body shape or trailing finnage that may be treated as rivals. Seriously Fish directly warns against those forms. OATA also warns that male Bettas can suffer intense fin-nipping from other fish, so avoid fin-nipping fish.

Avoid housing male and female Bettas together as routine companions. FishBase advises keeping the sexes separately except for mating, and breeding is a managed project rather than a community arrangement. This offer is for one male, not a pair or group.

Separate neighbouring males visually

If two male Bettas occupy different aquariums, arrange the tanks so they do not have constant direct visual contact. Persistent displays at a visible neighbour are not a substitute for enrichment. Add opaque screening or reposition the tanks rather than relying on the fish to stop reacting.

Check the separation from several angles. A divider that blocks the front view may still leave a clear line of sight through the side panels or reflections. Observe both tanks after room lighting changes because reflections can become stronger when the aquarium is brighter than its surroundings.

The RSPCA’s guidance on keeping fish together also recognises that male Bettas may fight their own kind. Make the dedicated single-male aquarium the starting plan, then any proposed community becomes a cautious exception requiring its own assessment and separation option.

Screen every community plan before mixing

No companion species is automatically safe with this male. Seriously Fish describes community tolerance as the exception rather than the expected outcome, although some individuals may tolerate carefully chosen fish. The honest plan is therefore to assess both species and still prepare a separate home.

Run every candidate through this screen

Shrimp, snails and fish fry should be treated as uncertain rather than as guaranteed companions. A Betta may investigate or hunt smaller animals, while larger or defensive invertebrates can introduce injury risk. Do not add an animal as a cleaning tool or live-food experiment.

Plan the failed-combination response first

The alternative aquarium must be heated, filtered and mature before the animals meet. An empty container, uncycled spare tank or temporary divider is not an adequate response to active pursuit or injury. Decide which animal will move and make sure it can be transferred without dismantling the main aquarium.

Observe feeding from start to finish. A candidate may avoid direct aggression yet still prevent the Betta from eating, occupy the only calm refuge or keep it away from the surface. Assess the welfare of both animals rather than judging success only by the absence of visible fighting.

Watch both animals during feeding and at quiet times. Separate them if you see repeated pursuit, blocked surface access, persistent hiding, fin damage, missed meals or displacement from a refuge. A combination that appears calm briefly may still fail after territorial behaviour develops.

Answer the main buyer questions

How big does the Big Ear Plakat Male Betta Mix get?

FishBase records a maximum adult length of 6.5 cm for Betta splendens, so plan the aquarium and furnishings around that size.

What size aquarium does this male Betta need?

Use at least 20 litres with a mature filter, heater, thermometer, secure lid, gentle flow and clear surface access; Seriously Fish gives 45 × 30 cm and about 41 litres as a stronger species reference.

How many Big Ear Plakat Male Betta Mix fish can I keep together?

Keep one male per aquarium. Avoid housing two males together, and keep males and females separately outside a managed breeding project.

Does the Big Ear Plakat Male Betta Mix suit a beginner?

Our care assessment is intermediate. A careful beginner can keep this fish after preparing a mature, heated and filtered aquarium, learning to test the water and planning one male per aquarium.

What does Betta splendens eat?

Feed a suitably sized complete Betta pellet or quality flake once daily in an amount eaten within a few minutes, with small live or frozen foods such as daphnia or bloodworm as variety.

What temperature and pH does this fish need?

Use Tropical Fish Co’s stable 26–28°C routine target; OATA’s broad Betta guidance gives pH 6.0–8.0 and 4–12 dGH, with ammonia and nitrite at 0 mg/L.

Is the Big Ear Plakat Male Betta Mix aggressive or likely to have its fins nipped?

Males fight each other, so keep one male per aquarium. OATA warns that male Bettas can suffer intense fin-nipping from other fish, so avoid fin nippers and fish with trailing finnage or a rival-like shape.

What kinds of fish or invertebrates can live with it?

Solitary housing is safest. Seriously Fish says some small cyprinids and loaches may be suitable after careful screening, while shrimp, snails and fish fry remain uncertain; assess adult water needs, space, feeding and temperament and prepare a mature separation aquarium.

How does this male Betta arrive alive?

Start filming every delivery continuously from the sealed parcel before floating the bag, recording it being opened with the fish still inside the sealed bag. Someone must be present to receive it; float the bag for 20–30 minutes before release and never pour the bag water into the aquarium.

Reference the identity, welfare and husbandry bibliography

• FishBase — Betta splendens: accepted identity, family, wild environment, natural diet, behaviour and recorded maximum length.
• Seriously Fish — Betta splendens: aquarium footprint, water ranges, furnishings, feeding and compatibility.
• Ornamental Aquatic Trade Association — Siamese fighting fish: UK group husbandry, maintenance, feeding and social guidance.
• RSPCA — Aquarium filters: biological filtration and nitrogenous-waste processing.
• NCBI Taxonomy — Betta splendens: scientific-name check.
• Kwon et al. 2022: domestic Betta colour, fin, body and behavioural diversity.
• RSPCA — Keeping pet fish together: social-housing and compatibility welfare.
• MSD Veterinary Manual — Management of aquarium fish: water-quality-led health investigation.
• OATA — Find a fish vet: UK fish-vet directory.