Red-bellied Piranha
Pygocentrus nattereri
The Red-bellied Piranha (Pygocentrus nattereri) is an aggressive fish that's rewarding to keep. Give it a tank of at least 605 litres (160 US gallons), water held at 75-82°F, and a pH of 6.5-7.5.
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.
Red-bellied Piranha Tank Setup
Treat 605 litres (160 US gallons) as a starting point - big predators need length, strong filtration, and a secure lid. Hold the water at 75-82°F and pH 6.5-7.5, and assume anything small enough to swallow will eventually be eaten. They grow to around 32 cm, so plan the tank size and filtration for a full-grown adult rather than the small juvenile you see in the shop.
What Do Red-bellied Piranhas 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.
Red-bellied Piranha Tank Mates
Requires a large tank and good filtration. The Red-bellied Piranha is aggressive, which is the first thing to weigh up when you choose tank mates. It's predatory, so anything small enough to fit in its mouth will be treated as food rather than a companion. 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 Red-bellied Piranhas Good for Beginners?
Care demand varies by line and setup. Match the care level to how often you actually test and change water.
Red-bellied Piranha - frequently asked questions
What size tank do Red-bellied Piranhas need?
Red-bellied Piranhas need a tank of at least 605 litres (160 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
What water parameters do Red-bellied Piranhas need?
Keep them at 75-82°F with a pH of 6.5-7.5, 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 Red-bellied Piranhas eat?
Red-bellied Piranhas 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 Red-bellied Piranhas good for beginners?
It depends on the setup. Match Red-bellied Piranhas to how often you actually test water and perform maintenance.
Common mistakes with Red-bellied Piranhas
- Underestimating tank size - the minimum footprint is 605 litres (160 US gallons); impulse buying into a smaller tank leads to stress and shortened lifespan.
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.
Check Red-bellied Piranha against any other fish → Compares water parameters, predation risk, fin nipping and tank size, and draws both at life size.
Fish to avoid mixing with Red-bellied Piranhas
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
- Zebra DanioFin nipper - will shred the fins of peaceful fish
- Neon TetraSize risk - Red-bellied Piranhas will likely eat Neon Tetra at adult size
