i have 1.3 1.4 and they are in a 15" x 13" x 7 1/2" tall lab bins and produce 30-40 babbies every month.i feed them the regular block food and as a treat every 2 weeks i give them mouse/hamster food.i never had any eat there young.i cought them male even bringing babbies back to the nest.when the babbies start opening ther eyes i always see a new fresh litter mixed in 2 weeks before i pull out the one i see eating and drinking.if you keep it clean every week or two and put a cheap plastic dog bowl as a hide in there they will breed like rabbits.everything i stated in here seems to work perfect for me.hope that might help.

NOTE::supliments dont work.i tested it out on one breeding bin and seen no diffrence from the others.good luck....