I've had mine, Elie, for 6 months. He was 8" long and is now 16+". I concur with the above. I can't keep shrimps or small fish. I hand feed him and play with him often. I would feed him shrimp and he would dart to a cave so he can wrestle with his food before sucking it down. If I'm fast enough, I'll catch him and let him wrestle around in my hand with his food. He does bite, but it is not purposeful biting. His eye site is terrible and he often hits my fingers instead of the shrimp, but he doesn't bite down too hard. He does nip at other bigger fish at feeding time, but again, it's not purposeful, he is just hungry. He has never knocked any of my corals down and even though his eye sight is terrible, he is a graceful swimmer.
Cheers,
Scott