Came back from a weekend away to my royal gramma dead and my clowns looking terrible. I think they may have velvet from what I read but am not positive. I attached pics. They do seem to hang in the stream of water flow and have “stuff” on them. I havent added a fish in over 3 weeks so am a little uncertain where this came from. I kind of assumed the gramma was taken out by high temps as the AC smart thermostat figured out we were away and went in to power save mode w the house temps pretty high. Is this velvet? If so what now? I don’t know that I can get the fish out w the rocks in place and have a bunch of coral and CUC inverts. Is there a Med that can be used in the reef display?