Introducing the Hermit Crab Pool With Ramp! Hermit crabs use water to wet their gills and the inside of their shells. The Hermit Crab Pool With Ramp is the perfect depth to wet their gills without risk of drowning. A hermit crab pool is a necessary addition to any hermit crab habitat! The hexagonal design was made with hermit crab clmibing in mind allowing for easy entry and exit of the pool to ensure hermit crabs do not get stuck. It is recommened that a hermit crab habitat has both a freshwater and a salt water pool. The Hermit Crab Pool With Ramp is made with safe plastic and will not cause harm to hermit crabs.