I loved the one I had. I noticed that he wasn't in his prime unless the water was cooler, around 76* max, otherwise he got lethargic and wouldn't eat. Didn't bother anybody else at all, as the other inhabitants were Catalina Gobys (great fish if you have a cool water tank! Tons of personality!)
Mine died of an eye infection while I was away after he was hurt diving into the rockwork when my father startled him at feeding time. I was very sad to discover this upon returning home...