Hello everyone, I am now the proud owner of a cast of 21 crabs. They are Coenobita variabilis. They arrived today. They seem to have settled in nicely and are eating, drinking, swimming, climbing, and swapping shells. In fact, two swapped into new shells almost immediately upon arrival. I'm open to any and all advice you good people here can give me. Cheers! edit: I'd like to get a hydrometer. Anyone have experience with choosing a good one?