New crabs, not sure what species
 

So I bought a couple of crabs today from my lfs...and the tank was labeled as fiddler crabs. This store however is kinda notorious for mislabeling species though, and after looking up some info on fiddler crabs I really don't think that they are indeed fiddler crabs. They don't have the oversize claw...but I suppose they could both be female...from what I've read it says the females don't have the bigger claws...any good way of identifying them?

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