Sorry to make light of your situation - I have not had much luck with Anthias myself, and stopped trying. They always seem to have some issue, and just aren't very robust fish. And there's always an asshole among them.
So far there are only two and not assholes yet. If they stick around long enough we will see. I haven’t had anthias in a long time and I can’t recall how long the last ones stayed around for. If these go belly up then I will prob give up on them.Sorry to make light of your situation - I have not had much luck with Anthias myself, and stopped trying. They always seem to have some issue, and just aren't very robust fish. And there's always an asshole among them.
Probably bacterial then. Uronema looks more like a red sore that erupts later.Ha ha - it’s actually white -fluffy? Idk