28qt and 32 Qt tub sizes work for adult males, and sub adult females. I would build a rack from 41 quart sterilite tubs if you have larger snakes....1500 grams plus...some people keep adult females in 32 quarts....other people would refuse to put a adult female in a 41 quart tub....it really comes down to opinion. But the most important thing is keeping the right Temperatures, and Humidity. 6 Quart will work for hatchlings, then 15quart, then 32, 41....thats How I progress. Good luck with your Balls