I had it in a larger tank but it didn't grow so I threw it in this tank and it still won't grow. It popped his eye when he was young so I think he is blind in his one eye. I feed him pellets, he would steal flakes from other fish, he gets fresh cut plants from my other tanks, he gets snails, worms, eatin numerous guppies. Never has shown any sign of sickness and gets his water changed. From what I have read online they will grow no matter what the size of the tank but he has more than enough room to swim in the one he is in. I think I just got a runt..... lol