Dwarf Mud Crabs (Rhithropanopeus harrisii)??

Has any one kept Dwarf Mud Crabs (Rhithropanopeus harrisii), or know if they are fully aquatic, I've found that they are truly freshwater or can be kept in freshwater as there are populations in freshwater lakes in the south and reproduce slowly but surely in freshwater. So my main question is are they like just about every other crab and need land or are they similar to thaI micro crabs in that they can stay submerged.
And on a side not does anyone know where to get thaI micro crabs? Every site that I see them on are expensive or always out of stock, and are these guys even hardy enough to be worth it?

 

Panther crab as well, I've been doing research on those as well and the majority opinion seems to be that they are not only fully freshwater but fully aquatic

 

I would check out aquabid.com. I have seen ThaI Micro crabs on there before for relatively cheap. May have to watch the inverts section for a week or 2 and find the best deals.

 

Yeah definitely aquabid. I always see some on there and the prices seem reasonable.

That being said I've heard they spend the vast majority of their time hiding. More than one person has told me that they added them to the tank and didn't see them again for months until they moved around the hardscape. So are cool as they look (I've thought about getting them a time or two) I do prefer to actually see the creatures I add to my tank.

 

Yeah I found some tmc for a decent price but I think they are just too small. But what about dwarf mud crabs or panther crabs? Any info on those?