Sounds like one to me or mantis. I would take it out but up to you.
It would explain why your snails and crabs are gone.
Put it in you QT tank and see if you can get it out of the rock.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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