What you want to do is remove all zoa from there, and fresh water dip for a minute or 2 and shake the pods off it. If you can transport the zoa into your tank, than that would be great. Let the wrasse get the pods for 3 - 4 days. Start to put small zoa in there and see if their open or not. If everything good, than you can start to transfer things back. Amphipods are good because they eat left over, but if there is not enough food, and their over populating; they will eat corals. If you search google on amphipods, you'll find some people posting same thing happen to your bf tank. I think I saw few youtube video with amphipods munch on zoas if you guys need more proof. Remember Reef tank is suppose to be part of ocean, and ocean is constantly providing food for the corals, fish, and other things. If you don't feed your tank enough, the critter or they might eat other stuff.