I have placed a couple of purple tangs in the same tank and they did fine. In my personal tank I have 2 yellows, i sailfin, 2 hippo's, and adding an atlantic blue as well as an achillies. I did have a powder brown in there at one time but it lasted 3 minutes as I placed it in the tank, it went out of its way to swim and snuggle in a long tentacle. Personally I think it road the short bus to school. DUMB FISH!!!! All in all I have a total of 24 fish in the tank.