Nice land crabs. I've seen these at various stages of life in Puerto Rico. They frequently occupy burrows at the edge of rivers and ponds -- and occasionally follow streams surprisingly far inland -- so it may be worthwhile to allow them access to freshwater and a tub of moist sand.
Here's one I encountered a few years back in Rio Grande:
to my knowledge they don't reproduce in captivity then again theres 0 info on them
If you have females, they may well become gravid, but the larvae require saltwater to develop. In other words, these present a challenge similar to that posed to freshwater aquarists by Amano or bamboo shrimp (not so much insurmountable as judged to be too much trouble and left unattempted). There's at least
one scientific paper on the larval development of
Cardisoma guanhumi, and several hobbyists have successly bred red-claw crabs in captivity, so the possibility deserves to be kept in mind.