Breeding and Caring For Yabby's

I want to start breeding yabby's. I have 6 tanks setup with air pumps. the tanks are only small, around the 20-25L mark. I would love to know if anyone has had experience breeding blue claw yabby's and what you have found works. also any tips you may have would be awesome! if anyone can give me some pointers as to what the environment (feeding,temp etc) needs to be like for them to breed that would be great! If anyone wants to put a pic of their setup that would be good.
many thanks