I can take some pics tonight. I have a Blue Hippo Tang, Yellow Tang, Green Mandarin, Bellus Angel, and Percula Clown. None of which I've ever seen pick at any corals or the zoas. I've also looked at the zoas up close to see if I could see any worms or anything eating them, but didn't see anything. Based on how very slow it's been taking place, as my sps have started to slowly grow more and more, I think it could very well be the SPS simply taking over the chemistry in the tank. I have 3 different paly's, and they're doing fine though, they have grown and spread quite a bit. I will take pics of the zoas tonight when I get home, then put them into our FOWLR tank for the time being before they all die and trade them away for sps or something.