How big of a ball are we talking? I personally don't agree with the "snakes get stressed in big enclosures" mentality. Ive got a 800 gram ball in a AP t8 (48x24x12) and she eats like a champ, sleeps during the day, roams alittle at night and is very calm. So I doubt the extra 5-6 inches will matter. if anything I bet it would be appreciated.