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Many crabs will kill snails for their shells, often deciding they won't like snail shells. Also they bother corals when they walk on them and can be clumsy and destructive. They do clean, but most aren't very efficient (scarlet hermits are pretty good at it I think, but will eat coraline) I prefer snails. I have thought about setting up a little 3 gallon just to keep hermits before. They are interesting, but I don't think they are the best for our show tanks......
Dan
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This laughter is ill-informed!
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-Kennpachi
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