Well everyone gets along great. I put everyone in the bathtub and they all shared treats and then slept in a big pile together. So, I cleaned out the tank I currently use and just put them all in there together. I'll transfer them to the new cage when it gets here. Then I separated the babies into their own-sex tanks, which gives everyone more space and now Beezus and Rosie can stop nursing (the babies are four weeks old).