I breed mice for my snakes, and I really dont' have an oder problem. I keep 1 male to 4 or 5 female mice, all my feeders go into a 20L, and girl weaners go into a different tub. I keep them in my computer room with the heat at 75. I also use corn cob bedding, which i get from the local farm store, 40lbs for $6. that'll last me at least a month with weekly cage cleanings.
I got my set up the way it is by trial and error. I dont' like to use pine bedding because the urine soils it quickly, not absorbing it, hense causing the smell. get an absorbable bedding for them, it really does wonders....
Teri