I have Australian red claws which are also blue.
I have found them to be temperature sensitive and don't tolerate much of a temperature swing.
Mine also are not growing as fast as they are reputed to grow, but this could be due to the problems I was having with heating the big tub, since I reduced it to 100 gallons it is easier to heat over the winter and I do not seem to be experiencing losses now.
I had some that I put 5 each into a basket and added pieces of PVC as they are reported to get along well, but after 3 months I had only 1 big one in one basket and 2 in the other one...

For me the Jury is still out on the feasability of this one