Some people may come down on me for this but I keep my balls in a hatchling rack until the go off feed around 800 grams. If they go off feed sooner, I will move them as well. My advice would be to buy the tubs and build the rack yourself. Lllreptile.com has some pretty good tubs or you can buy ARS tubs that are not see through for the sake of the ball not getting stressed.