Favia dying back and showing whiting

[Deej1534]

This Favia has been doing amazing but today I noticed that it was dying off and hit it with a little water from the turkey baster I use to feed with and a bunch of whiting showed. I am not sure if something is eating it or what’s going on. It’s at the mid/lower bit of my tank and get med to low flow. I pulled what I think was a pineapple sponge from the bottom of it but I didn’t think that would eat the coral. I have some pics below.

 

[glb]

Is it the only coral having a problem? Is your Ca ok?

 

[Deej1534]

Is it the only coral having a problem? Is your Ca ok?

Yeah only one all others are doing great! Ca is at 420 ppm