Eliminate him.
Too bad you're not closer we could feed him to one of my cuttlefish. They turn crabs around so the claws can't hurt them while they eat them alive.
I don't know the species, but all crabs in rock are evil. Pretty much all crabs except acro crabs.
I can't tell from the pic but if he is furry he is for sure bad news, or if he has red eyes. Anyway if you can catch him I would. If you feel bad killing him then at the very least banish him to the sump.
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