I had to return mine, he did the same with one of my brains and ate a couple of polyps from my Turbinaria, he had to go, it was beautiful but I don't like fishes that mess with my corals, even though I love fishes. If he aquires the taste for corals there will be no going back, it will always pick on those corals and they will perish with time. Its really a 50/50 chance on these guys but I got the 50% I didn't want to
... If you like LPS
then you might consider returning it, if you don't mind the Copperband to picking on them keep it...
Best regards and good luck!!