If I was wanting it to eat Aiptasia, I would not feed it anything thing
other than the normal feeding of the current fish. Anything it starts
liking will replace it's natural food which is Coral Polyps and
Aiptasia. Give it a week to get accustomed to the tank, to find and start eating Aiptasia. Here is an underwater pic of a tide pool in Hawaii where no Copperband or
other Butterflyfish (nor Tangs) have been.

If a fish starts picking at coral or even looking at coral as if it might nibble, I train it using the methods described here.
Secrets of adding new fish, fish training and the miracle of Garlic Oil: http://utahreefs.com/forum/forum_posts.asp?TID=34014I used this method just recently to teach a Puffer to leave new fish alone.
Aloha,
Mark

808-345-1049
Edited by Mark Peterson - September 08 2013 at 5:52pm