For topics relating to crab care that do not fit into the other categories.
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The more the better. Exotics need a lot more substrate to dig in, which typically requires a much bigger tank. Personally I wouldn't go with less than a 40B or a 55 for relatively few crabs - they need the space and some types don't handle crowding as well as PPs. I don't know the specific crabs per gallon ratio since I don't own exotics, so maybe someone who owns some can chime in on their setup.
Crabbing since July 2014! 75 gallon with 12 Purple Pinchers.