I know they do grow really fast,but it is ok to put a juvie in a 20 gallon,atleast.nothing less.but,like yo said,they wont last long n a cage tha)t size.and those vision and neodesha cage are really good for burms big or small,and if ya want you can always make a custom cage.Im fixing to build a cage thats about 9 foot longX5 foot deepX5 foot high,that is a pretty big cage,and t should last for a really long time.I like to let them have room to move around some,but as i continue to get more large boids than i have now(3 for now:burmese,blood python,and redtail boa),but im planning on getting several more of different size,i personally like burms bloods and retics the most,but that may be me.and eventualy more larger lizards,smaller ones too,and a few caimans,and eventually bigger aligators,but for now its just the 3 that i have now.