rat in 20 gallon high aquarium

Question
Hi, i was wondering if it was okay to keep a or two rats,I'm not sure how many i can keep in my aquarium. I know they like to be in pairs and it would be unfair to keep them alone. My question is can i keep rats in a 20 gallon high aquarium(24 long 12 wide 15 high)? If i provide tons of ramps and stairs, since the aquarium is high and not long.I know the main problem about keeping them in aquarium is ventilation but this shouldn't be a problem since i pick the perfect area. Another question is, how many should i keep?It will probably be summer when i get them and i will have plenty of time to bond with him or them, please respond i need help.

Answer
It really is in their best interest for them to be in a cage only.  No matter the location of the tank, the air cannot circulate properly and ammonia odors are trapped, causing the rats to inhale irritants that damage delicate lung tissue. As babies tanks are ok but as they age, they need a roomy cage to climb in and to breathe fresh air.