mixing crabs

[Angelajean]

Hello,
We have a porcelain crab. My son would like to add another crab. He wants a porcelain or an emerald or both but I am not sure.
We are in our 40 gallon now. I just need to change my tank description on my signature.
Angie

 

[Bifferwine]

Either would be fine. :) I would go with the emerald just because it's different and they are great cleaners.