Oh, I was using the word "cage" generally. I didn't mean to exclude tubs. I've been considering racks with tubs. What do you mean by "very tight"? I saw a rack at a show where the tubs seemed to slide out very easily, I would call that loose, but the seller assured me that the snake couldn't push the tub out of the rack. How long can a baby live in 6 quarts?
By "very tight" she means small. Babies do better with limited space, bigger scares them.