I have had this acro in my tank for awhile. There is a purple plating monti that started to shadow it, so I fragged the monti to help give it more light. All of my other corals have been doing well, but after I gave it more light it developed a white area as you can see. There are still polyps/coralites that are still there and it has not spread. My question is what might have caused this .. sudden light change .. or not thriving well in my tank? Also what type of acro it might be.
