The reptile store close to my house has a burmese, a retic, and an anaconda living together in harmony (or so it seems). It's a 5 x 15 floor-to-ceiling glass "room" with a "wading pool" on one end and gigantic branches all over the place. Not sure how they get belly heat but there are several basking lamps hanging from the ceiling on one end. They're not for sale.