I think it really depends on how you define 'adult'. I'm pretty sure a 41 quart is equivalent to an ARS-70 series tub. My biggest snake in that kind of tub is 1500 grams, considered an adult ready to breed female. I think this snake fits perfect in a 70 series tub. However, some ball pythons can grow to 5000+ grams, take a look at this 4000 gram female:
http://www.morphmarket.com/us/c/rept...-pythons/28197
I think a snake that big would be cramped in a 70 series tub, and if you plan on breeding I'm not sure you'd want to put a male and female in the same size tub. Most ball pytons don't get that big, it really depends on how heavily you feed them. I feed my females twice a week (or at least offer food twice a week) and they are growing super fast, mainly because I breed my own rodents and I have plenty to go around. I can see my snakes getting that big in a few more years. But most people only feed once a week or once every 2-3 weeks once they reach adult size and will never get that big.
Here's my 1500 gram two year old normal in a 70 series tub (41 quarts). Not sure she will fit if she gets 3x as big... But I'd say all the pro breeders that I know use this size tub for adults.
