I dont know if I'd keep 51 tubs worth of rats in the house... But I currently keep 1 rack of 7 tubs and 1.3 groups in each tub in my snake room. I change bedding 1-2 times a week and so far it hasn't been bad. My snake room hold venomous animals, so the room is sealed off pretty well, so that might have something to do with it too. But staying on top of cleaning the is key I think. Very manageable with 7 tubs... 51 possibly not so much...