I wouldn't think it's any of those fish. I would bet that the suspect is amphipods. Happens to me alot when I don't have any predator wrasses. Wait an hour after lights go out and look at your zoas with a flashlight. I would almost guarantee that you have fat amphipods making a nice dinner out of your zoas. I lost many colonies this way until I figured out what it was. If you find that is the problem a melenarus wrasse or yellow corris wrasse is your best bet. Took care of my pod problem within a few days. Hope this helps.
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