Have you talked about this before? Never heard of using chemiclean like that before, sounds like a super useful tool anymore details about how you’ve used it? Do you dose the recommended amount still? Are you doing full tank treatment or as a dipBut besides that, adding chemi-clean has stopped certain rtn events for me in the past. When all water parameters appear perfect, and only certain corals rtn it is often a sign of infection. I’ve had colonies with their skin peeling and flying off stop dying mid treatment. It really is amazing, it’s like the coral glued its skin back to the skeleton.