When I get new fish in my tanks I feed thawed Cyclopeze for the first few days. I've never had a problem getting a fish to get down on some Cyclopeze when they first get into the tank. In fact my entire tank goes bananas for Cyclopeze.
I don't know if you've tried it yet but it fattened my yellow tang up nice and plump when I first brought him in. I also credit it with turning my little green carpet nem into Sarlacc The Magnificient. (Star Wars thing, if you don't get the reference then nerd up!)
And as others have mentioned the copperband butterfly is a very difficult fish. They get stressed pretty bad during capture, transport, and then into the LFS. By the time we see them they are starved, weakened, and probably have been exposed to a number of parasites and diseases they aren't prepared to fight off. It's not surprising that their survival rate in the home aquariums is very low.
Quarantine him if you can, and try to fatten him up. A fish that's eating has a much better chance to fight off disease and injury.
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