04-16-2012, 05:10 PM
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It's common for fish stores to fill you with lies about these lovely crabs. Even my store filled with knowledgeable fish people still sells these as freshwater.
The other crab type is probably a fiddler crab, males have one large claw for sparring.
The sad truth is both of these species are in fact brackish water animals, and require a salt content of 1.005-1.01, with proper marine salt, not just freshwater aquarium salt. When left in freshwater, these crab species both become weak and barely survive more than a few months, while in proper conditions should live several years.
They will eat fish, and they also need to have a lot of land access, the ideal tank having a gradual slope of sand going into water. They like their food sprinkled across the sand so they can naturally forage.
In a 10 gallon, you could fit in 2-3 fiddlers. No fish. All males, or all females. Or you could do a mix, but you always have to have more females than males, as females will start killing "extra" males. Not sure about the red claws, haven't looked into them much.
Info on these guys is incredibly sparse considering how common they are, and I've been interested for a while now, if you're still interested, I'll try and help you out, I don't think anyone on here keeps these wonderful animals.