That's interesting, and I'm very sorry to hear of this. It's a mixed blessings sort of bag though because I was worried it could also have been your filefish, so I'm sort of relieved to hear it's likely not him, but yet, it doesn't change the fact that the corals are distressed. So I wonder what the trick is with LPS especially now at this given point. To suspend zeo at this point likely solves nothing, perhaps the answer lies in a severe reduction of the zeolites and additives, ie., perhaps down to 20-25% of the recommended amounts/volumes for your given volume ??
Hope you figure it out. And sorry for your LPS too there Des.
FWIW when I ran zeovit, my LPS never really reacted like this, although at the time, I had a CBB who enjoyed nibbling on things like Acan's .. I was never able to keep too many things because of that anyhow. If memory servers, I had candycane (both green and pink) and Euphyllia.