Quick side note....the can still breed like this. Even having two cages butted up next to each other they can and will breed through the cage...
I hadn't ever thought of fixing mice...Not really an option for me, but interesting nonetheless.
I'm really thinking that I may set up two small breeding groups (1-2 or 1-3) so when I bring up a new male or female I have the option of not inbreeding them. I'm going to start checking around and seeing what tubs I can find around here and see what kind of set up I can make work.
Where do you guys get your mice to start your colonies? I know I'm not getting them from PetCo...