its a clown coris wrasse, Coris Gaimaird, usually reef safe, but do easily depopulate snadbeds of critters. i have had one in my 135 for three years now (he started back in my 75) and is about 6 inches long and still not fulley grown. the only problem i have with him is that he can knock corals over hunting for pods, and he has killed several clams by flipping them over or covering them in sand, but this has been my only arguement against him!
good luck
jon