Salt AND fresh water is required! The hermit crab will make up his own mixture of water that he keeps in his shell. Great example of proper hermit crab pools! :) Crabitat Pools by ~GodzillaHermitCrab on deviantART
Hermit Crab - Hermit crabs are decapod crustaceans of the superfamily Paguroidea. Most of the 1100 species possess an asymmetrical abdomen which is concealed in an empty gastropod shell carried around by the hermit crab.
(link) Hermit Crab Anatomy ~ Female & Male (shown), and more! ~~~ NOTE: Excellent info, worth reading Hermit Crab Anatomy This page is all about the parts that make up this fascinating creature. ~ for more great PINs w/good links visit ~ have fun!