Coral help!!

[T33BLACK]

Woke up 2 days ago to my large coral looking like this ?!? Everything else in the tank looks perfectly fine gonna do some testing today. Any idea what this could be? It's been 2 days and still looks like this but everything else is fine.

 

[T33BLACK]

Use to look like this

 

[MrGisonni]

Shoot....that's bad. Some people might call for a medicated dip, I have never used them. You may be able to save some of the colony by fragging the living tissue away from the necropsis as a last resort.