I have a 6" cetopsis living just fine in my large community tank, with cichlids, largemouth bass, gars, lemon barb, bumblebee cat and a bunch of others. They like to hide. Usually at feeding time, I put a piece of thawed shrimp on a stick and feed him, so he gets to eat. Otherwise others will out feed him. had him for over 2 years. Here's his pic.