I do NOT want to start another closet. Right now I can still feed everybody before I go to work....add another rack and I'd run out of time. I don't want to be a slave to my frogs. I already have two 20s so I would only need three more. So sixty bucks at Petco. But then I'd have to hide all the Exos from the spouse. The frogs would get another nine gallons but they would lose two inches vertically.