Monitor the peppermint shrimps, caught mine eating out of my brain, plate, and Aussie favia mouths. I got rid of them, and my hermit crabs. Hermit crabs will kill snails, and themselves for a new home, even with bigger shells laying around. I would stick with snails, cleaner shrimp, and a sand shifter goby, maybe a emerald crab not sure how reef safe are they.