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I got a tiny little whitish crab with my lr... Should I try to remove him? He isn't big enough to get any fish... barely the size of a dime. He also is a night dweller.
I have a little acro crab that lives inside the branches of my acropora. It doesn't bother the coral at all and even tries to protect the coral by extending it's little claws and waving them around whenever a fish swims near it.
I also have an emerald crab and it doesn't bother any of my corals either, so I guess it depends of what kind of crabs you have in there.