Hello! Thanks for helping this newbie out with my redundant questions, I know enclosure size questions get frequently asked. I recently purchased an adult RTB, female. The people i bought her from said she is pretty much done growing at a little over 5 feet, they also believe she is Columbian but not sure. They only had her for 6 months so weren't sure her exact age, said she could be anywhere from 4 to 10 years old. Anyway, right now I have her in a glass tank with a screen top at 48x16x16. I want to upgrade to an AP cage but am unsure which size to go with. It was recommended to me by someone here to get the t13 (48 x 24 x 18), however I'm also considering the t10 (48 x 30 x 15) mainly due to spacing issues and difference in cost (about $100 difference). I live in a small apartment with a roommate and a little space saved on the cage would be ideal. However, I want my boa to be happy and be able to stretch out etc. Basically looking for advice on if the t10 would be a good option for me.

I am also inspired by the book "The Art of Keeping Snakes" and want to create a vivarium with real plants etc. In the book, he recommends having an enclosure with a perimeter of at least 2.5 times the snakes length, which would put me at the larger t13.

Any advice or opinions are much appreciated!