Well this is what I found. It may be unaccurate so I'm still looking for more information
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Fiddler crabs are often sold in pet shops as freshwater inhabitants. While in the stores they may be kept entirely underwater, and their water will contain no salt. Unfortunately for the crabs, they cannot live this way for long, and in under a month you can expect a fiddler kept in such conditions to die.
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and some more:
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Fiddler crabs must have access to dry land, as well as slightly salty water. They spend part of their time under the water, and part of their time out on the sand. The simplest solution is to line the aquarium with three to six inches of aquarium sand. Aquarium gravel will work, too, but they cannot tunnel through it as easily.
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_Yeah I really think a basking place is a must. One of the reason may be as the crabs shed their shell, they gotta have a good place to hide. Sand or mud basking place may provide them place so they can dig the 'hide-outs'
_If you petstore insists that it's aquatic they may want to mean crabs that live completely underwater. They may be wrong or I didn't look up carefully enough but I havent seen any source about that crab.
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