it'll need 3/4 land, and 1/4 water you will need to research, how to keep the sand damp enough for the crabs to live well.Link
I saw a really little one at a lfs today. Could one of these be kept in a 2 and a half gallon fish tank?
they really need brackish water to give them a good quality of life, and they do need to get out of the water, I'd say a 2 1/2 gallon would be too small for one.
12ukg"24x15x10"
How many gallons is this?