Acanthastrea mouth bleaching?

[suikerspin]

Hey r2r.

This acan has been in the tank for 2 months now yesterday it was fully puffed up and colors where good.

This morning all the heads are shriveled up and of the heads looks like the mouth is bleaching

Should i be worried it went like this overnight and really havent shown any signs of stress in the last 2 months.

 

[Gumbies R Us]

#reefsquad

 

[suikerspin]

I gave it a light blow off and the part that looked bleach just came off was completly dead tissue.