I've got 3 small colonies of 1.4 mice going. They really aren't any tougher than asf colonies to start. Just put them together as juvies and nature will do what it does. I really don't find either of those any tougher than regular rats to breed, either.
I leave my groups together at all times, and remove babies once they're old enough to wean. they go into 20L growout tanks until they're big enough to feed or freeze.
Best of luck.
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