Mine, {the one Ben now has}, cleaned out all my aiptasia. He also ate and type of fanworms and I would assume pods. I know this because my fat old mandarin started to lose weight.
The copperband also ate frozen mysis and other frozen foods. Then one day, {after 2 almost 2 yrs.} he started to nip at my crocea mantles. Never ate them that I could see. I ended up trading away, 4 of the most beautiful clams you have seen.
I then, {on the advise of several very experienced aquarists}, started to feed the copperband the supermarket fresh Manila clams. He ate them with gusto and it became his main food, besides some frozen. Those that have done this in their large show tanks, said this kept them happy and they lefy the ornamentals alone, {which I had a hard time understanding how it could tell the diff.}
When Ben was looking for a copperband, I gave him mine, {yes, he knew about its appetite for clams}, but we figured since these other aquarists had luck, he may leave Ben,s clams alone. As you can see, thats not the case, which is what I figured it would do. To me, a clam, is a clam, is a clam.
Would I put one in a reef aquarium again. I think not. Mine was a beautiful fish though and a superb fish to have. He was always in my hand, eating mysis or something and criused around in the open. As mentioned, I traded 4 beauties {clams}, so as to keep him. However just to hard on many of the tanks creatures. So I guess it depends on what ones wishes to keep. Mine never bothered any lps I had, by the way, only clams.