Thanks, That is an Atlantic Blue tang. He is getting HUGE!!!! He loves to eat. I hope to get a 180 for him to swim in. I stacked the rock in the center because I have the tank set up as a room divider. I works out well because the tang loves to swim circles. He is not my only fish. I have 2 Ocellaris clowns, a six line wrasse and a Mandarine.