Freshwater Fish · Bettas

Short-finned Betta

Betta splendens

The short-finned plakat: an athletic betta that lives aloneBeginner

Lifespan: 3-5 years
Size: 2-2.4 in
Social needs: Solitary (males); kept without tankmates
Time: 10-15 min daily; weekly water change
Cost: Low
Diet: Carnivore (high-protein pellets, frozen foods)

Overview

What is this animal?

Short-finned bettas, sold as plakats, are the same species as the long-finned betta, Betta splendens, with short, rounded fins instead of long, flowing ones.
The name comes from pla kat, the Thai name for fighting fish, and the plakat is the form closest in shape to the wild fish and to the fighting lines first bred in Thailand.

Short fins make plakats faster, stronger swimmers than long-finned bettas, and they patrol the whole tank and chase their food.

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Males and females look more alike than in long-finned forms, so check which you are buying.
Like every betta, a plakat does well only in a heated, filtered, cycled tank, never a bowl or a vase.

Temperament

Males are territorial and must be housed alone, as two males will fight and even a mirror can stress them.
Plakats come from the lines bred for fighting, and many keepers find them bolder and more assertive than long-finned bettas.

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Settled plakats are quick, curious and busy, patrolling the whole tank, flaring, following fingers, and learning feeding routines.
Females are short-finned too and can be feisty; a female sorority in a large, heavily planted tank is advanced and not recommended for beginners.

A good fit for

Keepers who want an active, fast-swimming betta
Anyone wary of the fin problems of long-finned forms
A heated, tightly lidded 24 in tank
Keepers who can commit to weekly water changes

Common mistakes to avoid

Gaps in the lid that a jumping plakat can find
Keeping two males together
Overfeeding causing bloat and swim-bladder issues
Buying a female as a male, or the reverse, without checking

Enclosure

Minimum 15 gallons

Must be housed alone. Solitary (males); kept without tankmates

Provide at least 15 US gallons in a tank at least 24 in long, such as a standard 15-gallon, with a gentle filter and a reliable heater holding 77-82°F.
Plakats are strong jumpers, so a tight lid with no gaps around the cables matters even more than for long-finned bettas, and it also keeps the warm, undisturbed air layer they breathe from.

Short fins cope with a little more current than long ones, but bettas come from slow, shallow water, so baffle a strong filter outlet.

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Plant heavily, add floating plants, a cave and broad leaves to rest on near the surface, and use driftwood or tall plants to break up lines of sight in a tank a plakat patrols end to end.
Cycle the tank before adding the fish and aim for ammonia and nitrite at zero and nitrate under 20ppm.

Check your enclosure

Supplies

Setup

Tank and stand
Filter
Heater and thermometer
Substrate, plants and decor
Liquid test kit
Dechlorinator and starter supplies

Ongoing

Quality betta pellets (fish or shrimp meal listed first)
Frozen bloodworm blister pack
Frozen daphnia
Frozen brine shrimp
Feeding tweezers or a pipette

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Small thawing cup
Fine net for removing uneaten food

Safe substrate: Fine, smooth sand · Smooth, rounded fine gravel (not for loaches or sand-sifting cichlids; sand is better for corydoras) · Bare bottom (quarantine and grow-out only)

Work out the cost

Care routine

Daily

Check temperature and equipment
Feed a few pellets
Head-count and look everyone over

Every few days

Check the finsevery 3 days
Top up evaporationevery 3 days

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Weekly

Check the lid and air gap
Test the water
Water change and gravel vacuum
Wipe the front glass only

Every few weeks

Trim and thin the plantsevery 2 weeks

Monthly

Check supplies and reagent dates
Replace or recharge chemical media, if you use any (skip it in a blackwater tank)
Rinse the filter media

Health review: Quarterly tank and fin review, every 3 months

Tools

Is your enclosure big enough?Check your measurements against the recommended size What will it cost?Setup, monthly and over its whole life, itemised Is this ammonia reading dangerous?Works out the toxic part from your pH and temperature

Care in depth

Diet

Carnivore (high-protein pellets, frozen foods)

Plakats are carnivores and need a meat-based diet.
Feed a quality betta-specific pellet as the staple, supplemented several times weekly with frozen or live bloodworms, daphnia, and brine shrimp.
An active plakat hunts live food with real enthusiasm, and variety supports colour and digestion.

Feed only what is eaten in two minutes, once or twice daily, and include a weekly fasting day to reduce constipation and bloating.
A plakat's stomach is about the size of its eye however hard it begs, and overfeeding is a leading cause of swim-bladder problems and fouled water.

Health

Signs of good health, and the common problems

Plakats get the same illnesses as other bettas: fin rot, fungal and bacterial infections, velvet, ich and swim-bladder disorder, most traceable to cold water, poor filtration, or overfeeding.
Stable warmth and clean parameters prevent most disease.
Watch for clamped fins, dulling colour, lethargy, and loss of appetite as early warning signs.

Short fins are a real health advantage: they do not weigh the fish down or tear as easily, so plakats are much less prone than long-finned forms to fin damage, tail-biting and exhaustion.
Short fins also make them better jumpers, so keep the lid closed.
Quarantine new plants and decor, and treat illness promptly with the correct medication rather than salt alone.

Is this urgent?

6 warning signs and how fast to act, 3 of them right away

In a fish tank the patient is usually the water. Test before you treat: dosing a healthy tank for a disease it does not have makes things worse.

Go now

Any detectable ammonia or nitrite in a stocked tankLarge water change now with dechlorinated, temperature-matched water. Stop feeding. Test again in 12 hours. Both are directly toxic. How toxic the ammonia reading is depends on pH and temperature, so the same number can be harmless or lethal.

Now

Fish gasping at the surface with fast gill movement, or crowding the filter outflowIncrease surface movement now (gently in a betta or gourami tank, without creating a strong current), then test the water. Either the oxygen has crashed or the gills are being chemically burned. Both are hours-scale problems. Bettas, gouramis and corydoras rise to gulp air as part of normal breathing; the warning is constant gulping, fast gill movement, or the whole group hanging at the top.

Now

Sudden deaths, more than one fish in a dayTest ammonia, nitrite, nitrate and temperature before doing anything else. Do not add medication yet. Multiple simultaneous deaths usually point at the water or the equipment rather than a pathogen, so rule those out first.

Now

Today

Flashing: repeatedly scraping against decor or substrateTest the water, then look closely for parasites. Irritation is either chemical or parasitic; the test tells you which before you medicate.

Today

White salt-grain spots over the body and finsBegin the appropriate treatment today and check the temperature. The parasite's life cycle is temperature-driven, and it multiplies with every cycle you wait.

Today

Soon

Clamped fins, hiding, or refusing food for more than two daysTest the water and review recent changes. Usually the earliest visible sign of a parameter drifting.

A few days

Never add a new fish to a tank that is not fully cycled, and never treat blind. A test kit is cheaper than the fish.

This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it, and the time to find one is before you need one.

Bedding and substrate

3 safe, 4 with a caveat, 2 to avoid

Substrate in an aquarium is a filter as much as a floor. Most of the biology lives in and on it.

Safe

Fine, smooth sandCorrect for corydoras, kuhli loaches, eartheaters such as rams and acaras, and anything else that sifts or burrows. Barbels wear away on sharp gravel.

safe

Smooth, rounded fine gravel (not for loaches or sand-sifting cichlids; sand is better for corydoras)Rinse thoroughly before use. Grain size should be too large to swallow and too small to trap food. Kuhli loaches need sand to burrow into and rams and acaras sift mouthfuls of it; bronze and panda corydoras manage on smooth fine gravel, but sterbai corydoras need sand.

safe

Bare bottom (quarantine and grow-out only)Legitimate for quarantine and grow-out tanks. Easy to clean, but it holds far less biological filtration, and it is no long-term home for burrowing loaches or sand-sifters.

safe

With a caveat

Crushed coral or aragoniteDeliberately raises hardness and pH. Correct for rift-lake cichlids, wrong for soft-water species.

with a caveat

Aquasoil for planted tanksExcellent for plants, but most active soils soften the water and pull pH and KH down for months, and many leach ammonia for the first weeks. Right for soft-water species; wrong for hard-water animals (livebearers, rainbowfish, goldfish, and snails, whose shells erode in soft, acidic water) unless you test GH and KH and remineralise. Cycle around it; do not stock into it.

with a caveat

Very deep sand bedsAnaerobic pockets form below about 2 inches in still sand. Either keep it shallow or keep it stirred.

with a caveat

Painted or coated gravelUsually fine, but coatings chip. Test a handful in a jar for a week first.

with a caveat

Never

Sharp or angular gravel with bottom-dwellersWears down barbels and leads to infection in corydoras and loaches.

never

Anything containing metal, limestone of unknown origin, or shells in a soft-water tankSlowly alters chemistry in ways that are hard to diagnose later.

never

This is our general list for freshwater fish. We have not built one specific to Bettas yet.

Top resources for more info

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