if it is variola louti, it will get huge! they can get to 3" in the wild, so it could get to be 24"+ in your tank. they are really cool fish. i hope you have a large tank, because they need one, at least 200 gallons imo, probably larger. if your tank isnt big enough, you could always exchange when he gets too big for a miniatus, blue line, etc. depending on your tank size. hth, bo