Let it move underwater for a long time, deviating from its original living environment. At the same time, it lives in a primitive state, and the water quality has some salt, but our tanks are all fresh water tanks, so it is difficult for it to survive for a long time.
So if you want to raise this crab well, you must create a state close to its native place and make some special arrangements. For example, adding some salt to our water, and then trying to create an alternate state of land and water for it, is more conducive to its survival.
The suggestion is to raise separately. Of course, most fish friends, as a kind of curiosity, can normally keep it in a fish tank as an ornament.