My acans seem to be fine one day and then I come back the next and half a polyp is missing. It is not a gradual thing. Here are the fish that I have in my aquarium. -1 multi colored Fairy Wrasse - 2 Ocellaris clownfish - 1 starry blenny - 1 disbar anthias - 1 Yellow prawn goby - 1 red starfish Recent changes: I now have a media reactor and placed carbon and phosguard in it about 3 weeks ago it is running 24-7. Yellow Tang recently died, it had been picking on the blenny, so now the blenny is free to roam more so than before. My parameters are all within normal limits. Calcium might be a little high.