I am pretty sure that it is black spot. I mean what else looks like finely ground black pepper with some bigger blobs mixed in? Could it be the worlds first case? lol I would take a picture. actually I did and I can't get a shot zoomed enough to show it any.
He does look better today. He lost most of the bigger ones, still has some finer ones but has better color. I can't say he is eating to well, But I am probably, in my haste to rehabilitate him offering him to much. He moves his burrow every few days or so. I don't think thats normal but he seems okay? I will keep trying to get him on the right track...
He has not been in contact with zoanthids I don't have any colony's. He did atempt to live under a large open brain though, but I think he had spots before then.