calico crabs How to tell is male or Female???

I don't know. Did you get one? If so, why? They are really bad predators and super aggressive -- they will eat fish, clams, corals, inverts, basically everything else in your tank. Cute, but there's a reason why they aren't normally available in the hobby.
 
No i didnt get one....my mother in-law has 2 and i dont wont one....they are terrible but a pretty crab. Just trying to see which is which
 
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