A month ago I bought several branching hammer corals and for a few weeks they were doing very well, until about a week ago when they began to recede to the point there was very little flesh visible. Tonight I captured these images while checking the tank under red light - any help identifying them appreciated. The only thing other than fish and coral I've put into the tank intentionally are Berghia Nudibranchs several months ago to tackle an aptasia outbreak.
Thanks!
Thanks!