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bucfan
02/10/2017, 04:39 AM
Always stays in rock. Does not have a shell. Appears to have one claw.

Ron Reefman
02/10/2017, 04:46 AM
The best I can do is guess that it's a crab in a hole!:debi:

It could be a variety of different crabs my my first guesses would be a Porcelain Crab or a Stone Crab, but that's as much because that's what I have in my tanks as anything.

Have you tried dangling food just outside the hole? My reef lobster comes out of his cave every time I feed.

Sugar Magnolia
02/10/2017, 10:27 AM
From the limited view, I'm thinking stone crab. They get very destructive as they get bigger.