Colombian Red and Blue Tetra
Hyphessobrycon columbianus
The Colombian Red and Blue Tetra (Hyphessobrycon columbianus) is a semi-aggressive fish that's easy to keep. Give it a tank of at least 80 litres (21 US gallons), water held at 72-82°F, and a pH of 6-7.5. Always keep a group of at least 6 - 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
South America
- South America
Regional colours match the stocking calculator's origin map.
Colombian Red and Blue Tetra Tank Setup
Give them a tank of at least 80 litres (21 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 6-7.5, and avoid sudden swings. Always keep a group of at least 6 of their own kind - kept alone or in pairs they tend to turn shy, nippy, or wash out in colour.
What Do Colombian Red and Blue Tetras Eat?
They're not fussy eaters - feed a varied diet, rotating good-quality dry, frozen, and gel foods rather than the same thing every day, and match the food size to their mouths.
Colombian Red and Blue Tetra Tank Mates
Bold active tetra; may nip fins. Keep in groups of 6+. Avoid with long-finned or timid tankmates. The Colombian Red and Blue Tetra is semi-aggressive, which is the first thing to weigh up when you choose tank mates. It's a known fin-nipper, so avoid bettas, guppies, and other slow, long-finned fish. It's a shoaling fish, so settle a group of 6 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 Colombian Red and Blue Tetras Good for Beginners?
Often recommended to beginners, but only after the tank is cycled and you can keep a proper school - not three fish in a new setup.
Colombian Red and Blue Tetra - frequently asked questions
What size tank do Colombian Red and Blue Tetras need?
Colombian Red and Blue Tetras need a tank of at least 80 litres (21 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
How many Colombian Red and Blue Tetras should I keep together?
Keep a group of at least 6. Colombian Red and Blue Tetras are a shoaling species and become stressed, lose their colour, or hide when kept singly or in pairs.
What water parameters do Colombian Red and Blue Tetras need?
Keep them at 72-82°F with a pH of 6-7.5, 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 Colombian Red and Blue Tetras eat?
Colombian Red and Blue Tetras are omnivores and aren't fussy eaters. Feed a varied mix of good-quality dry, frozen, and gel foods, and match the food size to their mouths. Feed small amounts once or twice a day, and remove anything they don't eat.
Are Colombian Red and Blue Tetras good for beginners?
Yes - Colombian Red and Blue Tetras are a good beginner choice once the tank is fully cycled and you can keep a proper group. They are hardy but still need stable water and a school to feel secure.
Common mistakes with Colombian Red and Blue Tetras
- Buying fewer than 6 - Colombian Red and Blue Tetras need a proper school to feel secure; isolated individuals hide, fail to colour up, or become stressed.
- Mixing with long-finned fish - Colombian Red and Blue Tetras will nip at bettas, angelfish, and other fish with flowing fins, causing stress and infection risk.
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 Colombian Red and Blue Tetras
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
