is it eating? if not, try frozen mysis and get some littleneck oysters from the supermarket. once its eating youre good to go.
i love mine, its my favorite fish.
Actually I just feed my fish brine and the copperband ate very well. I thought that was great considering he has been in this tank for just a couple of hours. He is hiding a little but that is typical. All of my fish I have gotten have hid for a day or so.