i have had my fella for about 4 years now. and he is great. very food orientated. always looking for food. its hard to have the tank set up nicely as they just bull doze everything down. they love weeds and stuff too and feeder fish/shrimps. good to watch. the only fish that lives with him is a rainbow fish, been in the tank for 3 years and they eat together and swim together, never even tried to eat him.