Ancanthurus Japonicus or Ancathurus Nigerius?
I have the Japonicus, or White faced Tang..The more hardy of the two..But not one of the easiest Tangs and they are very prone to ick and other diseases/parasites.. They are big swimmers and like the Powder Blue need a lot of room and strong water flow
I would not place one in anything under a 125 gallon, they need a 6' tank