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I've never noticed them killing sanils as long as there are sufficient empty snail shells laying around. Some people insist that it occurs regardless. Personally, I have a 10:1 ratio of snails to crabs, so maybe that has something to do with it, not sure. I don't like crabs because they steal food from corals, but otherwise no problems here. If you don't have corals that require feeding such as plate-corals or non-photosynthetic corals, this wouldn't be a problem. Also, I believe if you have sufficient shells they won't bother your snails, but you may need a lot of shells.
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Some people say, "How can you live without knowing?" I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know. - Richard Feynman
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