I had a crab identical to that in my old 36 gallon reef.
I wound up losing a leather and 3 fish to it, I actually saw this thing drop from a LR overhang onto a blackray shrimp gobie and clamp on with those legs so the fish could not get away and then used it's claws to finish the job.
It was insane to watch but I was shocked at how vicious a little crab can be and from that point, I NEVER give any crab the benefit of the doubt.
The one you have pictured looks so much like the one I had taken pics of though I can not positively say it is identical but it does look similiar enough for me to chime in....
Cheers.
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