When the babies are weaned separate the little boys from the little girls in two different cages so you can keep them all. For the smell house them in a larger cage. I would suggest two 20 gal aqariums. One for the boys and the other for the girls. Put screen tops on the aquariums to allow for ventilation and keep them out of direct sunlight. Fill the tanks with about 3-4 in of shredded aspen bedding. Watch for leaks in the water bottles. And regularly clean the tanks. Follow all these suggestions and the smell shouldn't be a problem. Mice eat a variety of things. A mixture of lab block, hamster/gerbil food and fresh foods 2-3 times a week shouldn't be a problem to afford. Mice can eat anything that is healthy for humans. So just give them a little of what you had for dinner that night.