Exclamation Point Rasbora
Boraras urophthalmoides
The Exclamation Point Rasbora (Boraras urophthalmoides) is a peaceful fish that's a good step up once you have a little experience. Give it a tank of at least 30 litres (8 US gallons), water held at 72-82°F, and a pH of 5.5-7. Always keep a group of at least 8 - they feel safest in numbers.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Southeast Asia
- East & Southeast Asia
Regional colours match the stocking calculator's origin map.
Exclamation Point Rasbora Tank Setup
Give them a tank of at least 30 litres (8 US gallons). As open-water swimmers they care more about swimming length than height, so a longer tank is ideal. Keep the water at 72-82°F with a pH around 5.5-7, and avoid sudden swings. Always keep a group of at least 8 of their own kind - kept alone or in pairs they tend to turn shy, nippy, or wash out in colour.
What Do Exclamation Point Rasboras Eat?
They have small mouths, so stick to small foods: crushed flake, fine granules, and now and then a treat of frozen or live foods such as daphnia or baby brine shrimp. Anything too large simply gets ignored.
Exclamation Point Rasbora Tank Mates
Tiny nano rasbora from blackwater habitats. Requires soft acidic water. Keep in groups of 8+. The Exclamation Point Rasbora is peaceful, which is the first thing to weigh up when you choose tank mates. It's a shoaling fish, so settle a group of 8 or more of its own kind before adding anything else - a stressed, lonely fish is far more likely to nip or hide. Before you buy, run your full stocking list through our stocking calculator. It weighs temperament, adult size, and water needs together, which a single species page can't do on its own.
Are Exclamation Point Rasboras Good for Beginners?
Doable once you test water regularly and catch problems before fish look sick. If this is your first tank, pick something more forgiving and come back later.
Exclamation Point Rasbora - frequently asked questions
What size tank do Exclamation Point Rasboras need?
Exclamation Point Rasboras need a tank of at least 30 litres (8 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
How many Exclamation Point Rasboras should I keep together?
Keep a group of at least 8. Exclamation Point Rasboras are a shoaling species and become stressed, lose their colour, or hide when kept singly or in pairs.
What water parameters do Exclamation Point Rasboras need?
Keep them at 72-82°F with a pH of 5.5-7, steady rather than chased to an exact figure. In a cycled tank, ammonia and nitrite should both read 0 ppm, with nitrate kept low through regular water changes.
What do Exclamation Point Rasboras eat?
Exclamation Point Rasboras have small mouths, so they need small foods. Crushed flake and fine granules form the staple, with the occasional treat of frozen or live foods such as daphnia or baby brine shrimp. Feed small amounts once or twice a day, and remove anything they don't eat.
Are Exclamation Point Rasboras good for beginners?
Exclamation Point Rasboras are best for keepers with a little experience. They are manageable once you test water regularly and catch problems early; a complete beginner may prefer something more forgiving first.
Common mistakes with Exclamation Point Rasboras
- Buying fewer than 8 - Exclamation Point Rasboras need a proper school to feel secure; isolated individuals hide, fail to colour up, or become stressed.
Building a community? Run the full list through the stocking calculator before you add anything else.
Great tank mates
Chosen from temperament, overlapping temperature/pH bands, plausible minimum tank footprints, and size versus yours in App-aquatic data. Hobby nuance always wins - verify stocking and temperament before purchasing.
Fish to avoid mixing with Exclamation Point Rasboras
These well-known species are commonly sold alongside this fish but are not recommended tank mates - verify before purchasing.
- OscarPredator - Oscar will eat or injure smaller tank mates
- Pea PufferPredator - Pea Puffer will eat or injure smaller tank mates
- Betta (Male)Predator - Betta (Male) will eat or injure smaller tank mates
