Small mortar tubs, 6 per rack ×4 racks of rats and 1 of asf. 2 females per tub, 3 males on a weekly rotation between all the tubs. Currently all on hardwood shavings but going back to pine since my source of free bedding is drying up. No smell at all until I hit about 10 days, full change out at 14 days. Maybe consider having fewer females per tub. Also what are you feeding? What goes in effects what comes out, might be something in their diet.