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Discovered this guy in a Liverpool I recently acquired. Been keeping an eye on him and he has been munching on detritus from his rock. Should I move him to my fuge?
It's a crab in the Pilodius genus. Best guess, maybe Pilodius scabriculus. Many reefers choose to remove, because it's in the Xanthidae family (aka gorilla crab, Xanthid crab). Really up to you to decide.
I have attached a link to a video so you can compare.