Racks tend to take up less space and secure lid to tub better.
yes the domestic rat is a type of norway
yes you can source some type of rat block at a feed store...(ie: Mazuri, Kent, Sand Valley, Harlen, Zeigler, Purina...there are tons of options)
inbreeding....this is a vague subject. Most inbreeding is done intentionally by limiting exposure.
If you have 2 tubs of 1.4
keep their babies separate and chose males from the first tub and females from the second...but even then they could be inbreed since the parents could be related even if they are bought from different stores. I supply most stores within 30 miles...so if you buy rats here locally, you are buying from my stock...which could have came from the same tub.
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