Re: Gold claw Crab ?
The rule I go by when it comes to crabs, crayfish, frogs, newts, and other specie other than fish is this "if it can eat fish it will so keep it in it's own tank"
I remember as a kid one of my friends parents thought it would be cool to put a fire bellied newt in their fish tank and within a week all they had left in the tank was the newt (darn thing ate everyone else). I have also heard similar accounts with people adding crayfish to their tanks.
Hope this helps,