Yes they can eat fish and snails. Also maybe a coral if it gets hungry. I found out where mine were and killed them with a screw driver. I did this while they were in a rock crevice and broke their shells. A bit nasty and sorry if it offends anyone, but works. You can also try to trap them, but might or might not work.
Crab seemed to come in on some new live rock, searched all over the internet, seems to be a stone crab, if so probably should get it out soon right? Sorry the pictures aren't very good, he's a shy little bugger. And he's only about the size of a quarter. Also the tips of the claws are black. I'll try and take some better pictures later.
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