I'm going to be experimenting with some different types of cages but I can't seem to find a minimum amount of space per rat. Pet sites (blegh) say 2 ft per rat, which seems close but slightly high for feeders. Lab recs say 450 sq cm, but I can't figure out how much space this is. I think it's slightly under 1 ft? My feeders and waterers will be outside of the cages, and I'd be keeping non breeders in these cages (I have separate maturity bins).
Edit: After some hard thinking it seems closer to 1/2 a foot for 450 cm?