Petco Red Calcium Hermit Crab SandOur Petco Red Calcium Hermit Crab Sand is a fine calciferous sand that"s ideal for hermit crabs. This sand stimulates natural digging and burrowing behavior and is an excellent heat conductor. This hermit crab sand creates a vibrant and arid environment for your pet and the naturally spherical grains won"t scratch your pet inside or out. Though not intended as a food source or supplement, calcium hermit crab sand is 100% edible and easily digestible which allows hermit crabs to ingest necessary calcium for proper bone development as well as reducing the risk of impaction.