Great advice and the exact link I would have used as reference.

As far as when to separate them? My weaned and small tubs are "co-ed"...I move to the medium holding tubs around 90-100g. That is when mine get sorted as that is also around the time when reproduction can become an unwanted issue. It can actually happen a little sooner than that I think but I haven't had any issues doing it this way with unexpected feeder litters.