Hermit Crabs?

I've seen some of em change shells several times a day while others would do it maybe once or twice a month.Just keep a few different sized shells behind your rock,that way maybe they wont kill as many snails.
 
Mine seem to have a swap system going, sort of like shell time shares. One leaves his, the other takes it, and vice-versa. But I hae sevral extra shells and they've left my snails alone, except for 1 of my nice striped trochus snails, which I'm pissed about! You can buy several extra shells at the LFS for cheap so they have room to upgrade.
 
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