favia coral flesh ripping off

[LuckyReefer]

so i’ve had this favia coral in my substrate in a low flow area and i noticed it starting to rip away and i moved it again and it just sort of got worse and now it just looks completely dead at this point and i’m trying to wonder why

 

[KrisReef]

Its dying. Could be light, flow or pests. Can't tell from your first post what those parameters are, or how old the tank is?