I'm not sure what you mean by juvinle in regards to size. A JCP that is 1 to 2 years old does fine in a 10 gallon aquarium. They actually perfer small housing. There is a long time running rule of measurement for snakes in regards to enclosures: 1.5 times the snakes length, of course this is species generic. If your into providing nature for your captive snake, no enclosure is too big!