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No, your corals should be fine. If the Aptasia has gotten big at all, the Copperband might ignore it. It did in mine, we'll see if it keeps the rest of it at bay. It doesn't eat flake or anything else we put in there, but he's sure not starving - so he's eating something in there. But our corals are fine.
Copperbands are a hit or miss though, sometimes they pick at clams and small polyps and featherdusters. I used to have one a while back, no major problems though, minimal nipping at motipora digitatas. Peppermint shrimp worked for me, I had 4 in a frag tank LOADED with aiptasia, wiped it clean in less than 3 weeks.