I did add some corals and anemonesIt's tough to say how this happened, but usually when this many fish are affected something else lowered their immune systems enough to take hold. I don't recall if you posted about adding anything new to the tank recently... a fish, coral, live rock, invert, anemone? I know you mentioned in another thread that you were dealing with water quality issues recently (most of us do at some point). You had several fish with large bioloads in your tank, perhaps tank maintenance slipped ... does this correlate to when the fish losses started to occur? Regardless of how it happened, I'm sorry you're going through it.