You should only have the large snakes in that kind of rack. I would highly advise against putting the smaller snakes in that size of a rack. That's too big IMO. I think they would have lots of stress due to the tub size. Just my $.02... I'm going to have adult racks and hatch/juvi racks. 32qt sideways for adults can usually use two 15qt for juvis so you house them in different combos. Shoe box racks for hatchlings. Good luck!
Regards,
B