Something eating frags?

I got a matted filefish to take care of some aiptasia. The fish ate all of the aiptasia and then dined on three zoa frags so it got moved to the QT.
 
The frags are on rather heavy plugs and were both on their side with the tips pulled far into the gap under the rock, which was a good 3 inches from their original position. I'm not sure how a Filefish would do that. If the Filefish had chose to eat just those two frags then I doubt he would have tried to hide them after and the flow wouldn't put them in that position.
 
You have any crabs in there? Crabs will move **** all over in my tank if not glued down. I have watched emerald crabs chomp off tips and base of frags. Pistol shrimp will also drag anything they can towards their den for more protection. If you have either I would suspect it's one of them.
 

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