The other essential for hermit crabs is a wide variety of extra shells. (petbusiness.com)
I like to cook extra shells since there always are a handful of shells that stick or break apart when cooking. (raegunramblings.com)
This recipe makes enough filling for about thirty shells, so it's likely you'll have a few extra shells, which may come in handy, as some shells break in the box or during cooking. (epicurious.com)