Help with Brain Coral

[windcoast reefs]

So I got back from being away for the weekend and I noticed that my protein skimmer leak some skimmate into my tank! I did a really fast water change and everything seemed to be looking fine until I saw my brain coral. It is showing its skeleton in the center and is releasing white goop. I have seen this on some of my corals that I have had shipped in and they seem to be fine after a month or 2. Is this the case with brain corals or is it dead?