Hermit crabs inhabit both inland and ocean side environments. Hermit Crabs require a salt bath to thrive and maintain their health. A salt bath should be placed in all Hermit Crab tanks, providing a source for their salt needs. Our proprietary Crab Salt contains extra calcium which strengthens the exoskeleton and is especially important when molting. Your Hermit Crabs will soak in the salt bath and collect an additional supply of salt in their shell that they'll then carry it with them.