I havent added anything new to my tank and just did a w/c 2 days ago and now my coral has this huge hole. Not sure if this is ok nor not. Help please.
It is right next to another toadstool but has been there for months now. Should I move one. Any ideas as to what’s going on would be greatly appreciated.

It is right next to another toadstool but has been there for months now. Should I move one. Any ideas as to what’s going on would be greatly appreciated.



