This morning I discovered my plate coral was white in the middle? Any reasons why
Yip, a picture could help us identify a possible problem.
Did you change anything about your lighting recently. (replaced bulbs / increased intensity / moved coral higher?)
Looks like physical damage. What fish do you have?
Yes I do dose kalk? Usind the slurry method! I have the green variety as well as his doing well
Either some kalk landed on it. Or somethings eating it. I had a monti eating nudi destroy my colony once. Look for tiny white eggs.