Neither of these animals lives in a freshwater aquarium environment. They are creatures of the sea shores, beaches and mangroves.
by rubbing their big claw on there body
yes they are
Ghost crabs? Well that depense if it is a dead fiddler crab so it would be the same/
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?
no they are not
no
They're in the crustation or the crabs group.
crabs are nocturnal
you kill the fiddler crab
fiddler crabs drink fresh water.