I have a Copper Band that ate the Aptasia for a few months after I got him, since he is well fed and not starving he has stopped and they are coming back in numbers. It was never the reason I bought the CBB but it was a plus that he did eat them at first. I've also tried Peppermint, but they became a quick snack for my Wrasse. Because they only eat Aptasia I plan on using Berghia Nudibranchs as soon as the temp warms up a bit to have them delivered. I was reluctant to use them at first because of the Wrasse. They are nocturnal so there shouldn't be a chance of the Wrasse bumping into them and from what I've heard if it does happen to try and eat one they taste lousy and will probably not do it again. They are expensive but do get the job done.