Males are a lot smellier also. I actually keep 1.10 or so at a given time and rotate the male in each level of the rack. At the end of the day you can control smell with different beddings (people say pine pellets mixed in works well), vanilla in the water, minimizing males, and cleaning the cages often. Of these, cleaning often is the way to go. If you smell them, they do too. Ammonia is just as harmful to them as it is to us.