At a glance the quick version
Seriously Fish gives 40 mm standard length; FishBase gives 5.6 cm total length.
Looks how to spot one
Scales, slender labyrinth fish
A small, slim wild betta with a deep wine-red body. It has a labyrinth organ for breathing air at the surface. Males have longer fins and a shimmering green patch on the flank.231
Personality what they are like
Fairly quiet and shy. Males hold small territories; some keepers manage small groups with plenty of cover while others prefer a single pair.23
Daily activity how busy a day looks
Low activity; it moves slowly among plants and leaf litter in calm water.2
Grooming and care the hands-on bits
Feed small portions because it gains weight easily. Keep a lid on the tank and keep the water soft, acidic and very clean with gentle flow.2
Home where they are happiest
A tank of about 40 litres (45 x 30 cm base) suits a pair or small group. Temperature 22-30 C (FishBase gives 24-27 C), pH 4.0-6.0, very soft water (about 1-5 dGH). Dim lighting, leaf litter, floating plants and tannin-stained water mirror its blackwater peat swamp home.21
Food basics what goes in the bowl
Small live or frozen foods such as daphnia, brine shrimp and bloodworm, plus some dried food once accepted.23
Company who they like around
Best kept as a pair or a small group on its own or with very calm tankmates; not suited to a busy community tank.23
The story where it all began
Described by Joerg Vierke in 1979, it gave its name to the Betta coccina group of small red peat-swamp bettas. Its home is the acidic blackwater forests of Sumatra and southern Malaysia.123
Fun facts for the dinner table
- 1
Its species name coccina is Latin for scarlet, after its body colour.2
- 2
It lives in peat swamp water that can be extremely acidic, with pH readings as low as 3 to 4.2
- 3
Broods are small, often fewer than 20 eggs, guarded in a male-built bubble nest.2
- 4
A labyrinth organ lets it breathe air, a feature it shares with all bettas.3
Recognised by the official bits
- IUCN Red List
- Vulnerable (assessed 28 December 2018)1
- Taxonomy
- Family Osphronemidae; described by Joerg Vierke in 1979; type species of the Betta coccina group2
The care rhythm a typical week and year
A typical home-care rhythm for a Scarlet Betta. A starting point, not a vet's advice.
- Feedingevery day
- Temperature checkevery day
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Filter rinseevery month
Owner questions the things everyone asks
How often should I feed my Scarlet Betta?
Feed your Scarlet Betta small portions once a day. It gains weight easily, so avoid overfeeding. Furry Diary's starting plan is to feed daily.2 Pet Wiki plan
What does a Scarlet Betta eat, and what should it never eat?
Offer small live or frozen foods like daphnia, brine shrimp and bloodworm, plus some dried food once accepted. Never feed large or fatty foods that could cause weight gain; consult a vet for specific concerns.23
How much space does a Scarlet Betta need?
A tank of about 40 litres (45 x 30 cm base) suits a pair or small group. This provides enough room for their calm, slow movements among plants.21
What temperature, light or water does a Scarlet Betta need?
Keep water temperature between 22-30°C (ideally 24-27°C), pH 4.0-6.0, and very soft water (about 1-5 dGH). Use dim lighting, leaf litter, floating plants and tannin-stained water to mimic its blackwater home.21
How often should I clean a Scarlet Betta's home?
Furry Diary's starting plan suggests a weekly 25% water change, a weekly water test, and a monthly filter rinse. Keep the water soft, acidic and very clean with gentle flow.2 Pet Wiki plan
Can a Scarlet Betta live with others?
It is best kept as a pair or a small group on its own, or with very calm tankmates. It is not suited to a busy community tank.23
How long does a Scarlet Betta live?
Lifespan varies depending on care and environment. For specific expectations, ask a good breeder or an exotic-pet vet.
Can I handle a Scarlet Betta?
It is best not to handle this fish; it is fairly quiet and shy, and handling can stress it. Keep a lid on the tank to prevent jumping.23
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.
Where this comes from
Every fact on this page has a numbered source. Spotted an error? [email protected].
- FishBase: Betta coccina summary fishbase.seused for origin, size, water parameters, IUCN status
- Seriously Fish: Betta coccina seriouslyfish.comused for care, habitat, diet, behaviour, etymology, breeding
- Wikipedia: Betta coccina en.wikipedia.orgused for other names, colours, history
Checked 2026-09-30. Text is written in our own words from these sources.