I'm assuming you mean Harris mud crabs... I had 3 of them in one of my tanks. I think they are truly aquatic, as they seemed to do great while I had them and they never attempted to escape. They are brackish crabs, but can transition into freshwater without issue, and are highly invasive because of it.
One of mine died after a failed molt, the other two lived for a little over a year before just kinda dissapearing. Not sure what their life span is.
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