I use a combination of tubs and tanks for my rats. I also build them hides with untreated lumber that they love to chew on, takes care of a hide and a chew thing. my tanks have wheels in them but my tubs do not.
I handle my breeders almost every day and let them run around. They are good pet types. There are a lot of plans in the section that you may look at. I especially liked the stick for the low space system. It is much like what I am doing.
Hope that helped.
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