HELP! Something is eating my green and blue Stylophora!

I woke up Sunday morning and noticed that something was eating away at my green Stylophora that night. Then i woke up this morning and looked at my tank before i went to work and something was eating my blue Stylophora. There are sections of both corals that are eaten down right to the skeleton. The parts that aren't damaged all of the polyps are out like normal but i got those sections on both corals that have been eaten away this is driving me nuts. I looked last night like a hour after the lights went off but i didn't find anything. Does anyone have any idea would it could possibly be?
 
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