I have Three huge anthelia that have crashed over night. I am not sure why this has happened the have been flourishing for a year now I also lost a cleaner shrimp last night but he is new to the tank. My water parameters are good but the ph was low at 7.8 but i have it up to 8.0 now. My questions do i have to remove them from the rocks i am hoping they may come back all my other corals look great.