Hello, welcome to the hobby. I have been told that Copper Band Butterflys will eat Aptasia. If you don't know, Aptasia is a nuisance glass anemone that given half a chance will take over your tank. If you want to purchase one you would need a fairly established tank. When purchasing it make sure to ask the store to feed it first and make sure it is eating, as I have heard they can be difficult to get to eat.
When it says Reef Safe: Monitor, I beleive it basically means that most of the species are reef safe, but some individuals have been known to cause problems. As far as compatability, I beleive that you have to be more concerned with other fish bullying this one. I believe most tangs and clownfish would leave it alone. Gobies are not a problem, they usually mind thier own buisness.
