Will a tub measuring 28 1/2 x 18 x 6 be big enough to house adult ball pythons? THe tubs are gong into a rack. These are the only size Iris tubs that I can actually get locally in my town. I can not afford to pay $20.00 shipping on top of the price of tubs for the CB70 or should I go with the Sterilite 1860 which measures 34 3/4 x 16 1/2 x 6 ? I do like the iris better if it would be big enough.