A friend of mine went to the extreme in that her tank became inundated with them. I mean every rock was a mass of them. She took her corals to our LFS, and put a butterfly fish in from the LFS. It ate what appeared to be hundreds in a very short time, but, it then came close to starving before she could get it out of her tank to return. Major difficulty in retreiving the fish. It still died at the LFS from not being fed correctly. We have a great team of people there however I think certain fishes should not be ordered unless they can be fed properly, or sold immediately to responsible buyers.