We have Suki and Neph in 30 gallon "Snug Fit Critter Cage" tanks. http://www.all-glass.com/products/cages/ccsnugfit.shtml We purchased them for around $60 at Pet Supplies Plus. Although we have the 36x12x16 size because both snakes like to climb, they also make a 30 gallon breeder which measures 36x18x12. I love the sliding tops on these, even though we have to cover the screens to preserve humidity. I don't think we'll need to get anything larger for Suki, but Neph will certainly outgrow his, and we'll pass it along to one of the babies.