Powder Brown can go either way. They will definitely not get along with any other of there tang genus, ie. Powder Blue. But I have my PB with 3 yellow tangs, Regal Blue, Coral Beauty and my trio of clowns. Shows no aggression towards anyone. He is a cool fish with lots of personality. But if I had the decision to start over I would not choose him again. The powders seem to get Ich faster than any toher tang. Its pretty bad when my Powder Brown can have an ich outbreak while the regal blue and everyone else stays perfectly healthy. Other than that he is one of my favorite fish due to his personality. But if your gonna keep him leave him in QT for at least 30 days. Mine has gone back to QT twice for a 30 day run. He gets these little white worms that start out looking like ich and even after copper and Prazi he seems to clear up and be fine until something stresses him out and he just starts his thing again.