At a glance the quick version
Seriously Fish gives about 9 cm SL and FishBase a maximum of 10.6 cm SL; Wikipedia gives 5 cm for adults
Looks how to spot one
Slender, elongated scaled cyprinid
A slender, elongated rasbora with a pinkish body. A dark band with uneven, crinkly edges runs along the side and continues through and past the eye. Colours look richest in tannin-stained water under soft light. Females are rounder and often larger than males.1
Personality what they are like
Very peaceful and easygoing, mixing well with a wide range of small community fish. It is more confident and colourful in a group.1
Daily activity how busy a day looks
An active schooling swimmer that needs a reasonably long tank with swimming space.1
Grooming and care the hands-on bits
Keep the water clean with regular changes. Dim lighting and tannin-stained water bring out its colour.1
Home where they are happiest
A tank of at least 120 x 30 x 30 cm (about 113 litres). Temperature 22-26 °C, pH 5.0-7.5 (FishBase 6.0-6.5), soft water around 2-10 °H. Dark substrate, plants, wood and leaf litter mimic its forest streams.12
Food basics what goes in the bowl
A micropredator feeding on worms, small crustaceans and insects. Offer small live and frozen foods such as Daphnia and Artemia, with dried food as a supplement rather than the only food.12
Company who they like around
Keep at least six together. Good companions are other small cyprinids, tetras, livebearers, dwarf cichlids, catfish and loaches.1
The story where it all began
Pieter Bleeker described this species in 1851. In the wild it lives in forest streams and peat swamp waters across the Malay Peninsula and western Indonesia.21
Fun facts for the dinner table
Recognised by the official bits
- IUCN Red List
- Assessed as Least Concern (January 2019)2
- FishBase
- Described by Bleeker in 1851; listed as a commercial aquarium species2
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Brilliant Rasbora. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseRinse in old tank water, never tap waterevery month
You might also like
Like what we are building? Buy us a coffee.
The breed atlas is free for everyone, with a source on every fact, and it will never show ads. If it helped you, a small tip keeps the research going. Any amount is lovely, and no is a perfectly fine answer too.
Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at [email protected] and we will fix it.
- Seriously Fish - Rasbora einthovenii seriouslyfish.comused for origin, size, tank size, water parameters, diet, behaviour, colour, facts
- FishBase - Rasbora einthovenii fishbase.seused for author/year, IUCN status, size, habitat, diet, spawning
- Wikipedia - Rasbora einthovenii en.wikipedia.orgused for distribution, alternate adult size
Checked 2026-09-30. Text is written in our own words from these sources.