The 40qt and 90qt sterilite containers are the same floor space with the only difference is height. 6" compared to 12" in height. My snake is around 30" long and 390 grams. Hes small for his size but doesnt ever come out of his heated hide spot except to eat and drink. Maybe thats normal but i would like a setup about 6-8" longer so i can have a hide on the cool and warm side and the water bowl in the center. I was gonna plan on putting in fake branches and plants in there to give a good look and maybe the snake would feel better coming out and roaming a bit since there would be more cover in the tank.