01-25-2013, 11:38 PM
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You cannot go wrong with snails, and plenty of them. I have a 20 gallon and have 3 nassarius, 5-6 mixed astrea and margarita snails. Hermits I've been lucky with as they haven't bothered any of my corals so far. I'd suggest, no matter how cool you think they look, to stay away from Coral Banded Shrimp. Mine wreaks havoc in my tank. He doesn;t hurt anything or kill anything but he tramples all over my corals and pisses them off.
ALso, are you sure you have true live rock? (fully cured). If it's not, you may not have gone through your cycle yet.