Two different species of fish, the Goldrim (Acanthurus nigricans) and Powder Brown (Acanthurus japonicus). Very similar though, a must for a proper QT treatment before introduction. Or then very suspetible to Ich and other diseases, they do well in aquariums, take to food well. If you can, they should be the last fish added to the tank, was established, they get aggressive to newcomers.
Agreed on the Goldrim > PBT though.