| I usually recommend 1 per 10 gallons. But I actually don't use hermits at all. Can't have one member of the clean up crew eating the others. Put some larger shells in there and feed them directly if you see them out and about alot. It's not natural behaviour for a hermit to be visible. If you see them, it's out of necessity to calm the growl in their belly.
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Renee | 
