In my 2nd post I said he was and Indian Trigger (M. indicus) or Hawaiian Black Trigger (M.niger or Black Durgeon). All indications say he is an Indian Triggerfish.
He is reef safe, about 6 inches and safe with other fishes. He gets to eat fresh frozen homemade food. I have him with a very small 1-2inch Maroon Clown, almost 3 inch Coral Beauty, 5 inch Kole Tang, 4 inch Diamond Goby. Believe me when I say this guy pays no attention whatsoever to the clown but the clown runs him out of her territory.
My tank is acrylic and the background is just blue with algea on it that has been textured by the Kole Tang.
By the way It was brought to my attention on this site the the fish is an Indian Trigger not the Hawaiian trigger that is posted for sale on this site even though the pic looks like mine they have it posted wrong. I sent them an email already.