They all seem to be getting along well. No mouse fights thus far so hopefully they will settle in and breed successfully. I've got them pretty much used to being handled so they've stopped squeeking and trying to nip me. Found a nifty trick with them. Instead of picking them up like I do the rats I just put my hand in their tank in front of the mouse I want to hold, tap their butt gently with my other hand and they walk right into my hand. Seems to make them less scared of being picked up.