A great way for hermit crabs to exit deep water dishes. Sea sponges have natural minerals from the ocean essential to the longevity of your hermit crab.
Hermit Crabs will benefit from a dish of salt water in addition to their fresh water supply. This conditioner adds natural sea salt as well as calcium in addition to removing chlorine and chloramines.
These are the biggest shells. These "big guys" are baseball to softball size.
Informative & to the point, this book is a great resource to learn about land hermit crabs.