normally just feed them just enough for a day as it will throw up sometime. It just dun know when to stop eating. If it ever throw up, I have to change the water... It seem happy in the 2ft tank, only the sucker try to suck on it and so it slam the sucker. It has make the 2ft tank it home and rom about every part of it... the best part of it is that I sometime can hand feed it...since i bought it when it was 3" now it about 12" plus... cant wait till it get 3ft...