Hm, I suppose both are reasonably possible. I am treating the tank with pimafix & melafix (today is last day & fish looks great!) So maybe the zooanthelae are jumping ship, all other corals are reasonably happy though. And up until 2 days ago, my favia was about 4-5" away from it... Well, I hope it makes it through, I wouldnt be too heart broken if it didnt though. Im about to start selling some of my shrooms cause I have too many