Finally got the gorilla crab out

Was watching my cbs then saw the crab claw sticking out of a small piece of rock out of the corner of my eye. Just removed the rock and pushed him out with a screw driver. What positive attribute could he add to my fuge? I read nothing but bad things. So far I have rock, aggressive damsel and chaeto in there
 
They're hardy cleaners. Yes, destructive if you like your fish or corals, but good scavengers otherwise. And they're just kinda cool in an odd way somehow.
 
The crab would eat any waste or leftover fish food that would make it to your fuge. Definitely worth keeping there.
 
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