I know this is a redundant subject, but I feel it addresses a different aspect. About two months ago my tank was covered in aiptasia and I went ahead and purchased a Copperband Butterfly from my LFS. The fish has dwindled the problem down to only two visible anemones. My question is how do you know when they are gone forever? Will they always come back? Should I take the chance by putting some corals in the tank with the Copperband? Any advice would be greatly appreciated.