WOW, Rick I think its my peppermint shrimp!
I had 5 Favia with about 10+ heads each all together on a large rock. They were spaced in somewhat different flow/light but were all doing great for a year + until I got the peppermint shrimp!
There are two large healthy Favia on there on rocks still doing great. I've lost 2 Favia completely and they others Ive moved to the bottom of the tank. Last night I got up and looked several times through out the night with a flash light and the peppermint shrimp were picking at them!
I had one aptisia and got 4 peppermint shrimp.....