I've heard success stories with people using clams on the half shell. What foods have you tried? Copperbands are a hard fish to keep and don't always eat when put in the home aquarium.
I think I’ve got the solution to get this guy fattened up while still in QT!! I’ve had this food for a while and decided to give it a try a couple days ago. It floats on the top for a little while and it melts slightly. He/she begins circling the food then starts nibbling at it. Then it starts...
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See my reply above on this thread. Regarding using a mesh feeder with closed sides.
My CBB favorites are blackworms, thawed clam on half shell, mysis & LRS Reef Frenzy.
I've heard they are notorious for being hard to eat. Try soaking mysis in selcon or garlic. Hopefully, you have it seperate from your main tank, because they can be outcompeted for food