Clown Knifefish
Chitala ornata
The Clown Knifefish (Chitala ornata) is an aggressive fish that's rewarding to keep. Give it a tank of at least 475 litres (125 US gallons), water held at 68-82°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
Asia
- East & Southeast Asia
Regional colours match the stocking calculator's origin map.
Clown Knifefish Tank Setup
Treat 475 litres (125 US gallons) as a starting point - big predators need length, strong filtration, and a secure lid. Hold the water at 68-82°F and pH 6.5-7.5, and assume anything small enough to swallow will eventually be eaten. They grow to around 80 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 Clown Knifefish 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.
Clown Knifefish Tank Mates
Requires a large tank and good filtration. The Clown Knifefish 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 Clown Knifefish Good for Beginners?
Care demand varies by line and setup. Match the care level to how often you actually test and change water.
Clown Knifefish - frequently asked questions
What size tank do Clown Knifefish need?
Clown Knifefish need a tank of at least 475 litres (125 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 Clown Knifefish need?
Keep them at 68-82°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 Clown Knifefish eat?
Clown Knifefish 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 Clown Knifefish good for beginners?
It depends on the setup. Match Clown Knifefish to how often you actually test water and perform maintenance.
Common mistakes with Clown Knifefish
- Underestimating tank size - the minimum footprint is 475 litres (125 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 Clown Knifefish 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 Clown Knifefish
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
- Clown LoachFin nipper - will shred the fins of peaceful fish
