White thing in Candy Cane Coral

[Benga]

I have no idea what it is, I only just saw it for the first time in the months i've had it.
I may have overdosed my tank a little with calcium but that's the only chemical change. I also added four new frags.

Any idea what that is?

 

[DSC reef]

Looks like it caught something floating around and is now eating it. I wouldn't worry.