Due to ammonia build up rat enclosures need to be better ventilated than say a tub for your snake. Mine have screens across the complete top of the tub. We are starting to breed rats and I am thankful that we chose the front room in the basement for them otherwise the whole house would stink. Granted we are up over 60+ rats now including pups and 9 or 10 adult mice and one litter of mice pups. By the end we want 54 breeding females rats, 3 breeder male rats, 18 breeder female mice and 6 males. Should supply more than enough for our collection and once we add an out building for the rats we will expand to a full capacity breeding program!
Yes 1400 gram females will be fine in a 32 quart tub for a couple of months. We have a girl over 2000 grams that is in a 32 quart tub. If we put her in a 41 quart she goes off food, but in the 32 quart she pounds her F/T rats every week like clock work!