Well.. my zoas and other living things are now opening as they use too.. and that's is driving me crazy. So this morning I was taking a look at the tank trying to see any worms or anything.. I saw these things: I was looking and many of my corals has this thing in it. But I also have an Threadfin butterflyfish new to the tank.. I am not seeing any bitting marks on the corals.. have anyone ever had problem with this fish picking on the coral? Thanks again guys!