I hope it's not, it's been a 3 days so far, and I've seen no slime like what I read about with the brown jelly stuff, and progression hasn't been super fast. I'll see what it looks like when I get home after work, If there is more deterioration, then I'm worried, if it's stopped, I'm blaming fish. I've got lugols I'll try to dip with if it appears to be progressing.
Another interesting side note, one of my chalices got moved about 8" across my tank and was gone before I found it. If it is a fish, I guess it's possible that they were picking on it before the acan.