Awesome news Malcolm, they must have been pretty big
I just leave holding fish alone in the big tank and strip them (as firenz said) at 2.5-3 weeks, as much as the fish seems to suffer its best not to strip earlier (unless you have a tumbler etc ready) as they dont seem to do so well. Of course the time taken shortens with a higher temp or genetics it seems, have stripped 2 yellows at the same time out of the same tank but I brought them from different places that bred on the same day and one had with free swimming babies one that needed babies in the tumbler for a few days.
If you have already moved the babies out into the container and they're getting alot you have setup then id leave them the male may be agro towards them if you just dump them back in. And the bristlenose shouldn't eat the babies I keep bristlenoses in all my grow out tanks to clean up any mess.
If you decide to leave the female's to spit naturally they may hold for upto a month and generally wont eat, some females figure out how to eat a little and filter it through their babies but not many and they still seem to get skinny as.
Good luck let me know how you get on