I think a 10 is too small for a rat (and way too small for 3) But your second biggest problem is ventilation. Your rats will never be healthy in these kind of conditions. Aspen also does nothing to cover the smell. All the good odor absorbers tend to be more expensive. I would try the charcoal trick that was mentioned. I've never heard i before but it sounds like it would work since most odor neutralizers are charcoal based.

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