This fish is incredibly beautiful however he grows to be quite large, 15". The Fish requires a 100 gal tank minimum, however i would recommend larger. They are Reef safe as juveniles however when they get older they get a taste for corals. So if your planning on keeping the fish and the corals i would say choose which you like more, Fish or Corals. Also at 5" the fish is already beginning to mature and loses the blue coloration and gets its Adult colors.