I have one in my 55 gallon along with the tank mates noted in my signature. I've had her since she was a baby and she's a total ham, never really bothers the other fish. The first two years I had her she went through this weird spawning stage and was laying eggs on one of the lace rocks and wouldn't let anything near them. She was however more agressive towards me than the other fish. I would stick my arm in the tank for cleaning or egg removal and she would litterally attack me. My husband got a kick out of watching her bite me.