Mine is awesome. Has never touched a coral. He eats any food I put in the tank (brine, mysis, plankton, spirulina). He is fairly aggressive and will bully some of the smaller fish, but nothing too bad. Of course he's in a big tank so he might chase for a minute and then forget about it. If you're planning on keeping one in a smaller tank (less than 100 gallons) be careful of putting smaller docile fish with him...