Ok. So have been lookkng around and i found some stackable pvc enclosures. That come in 2 sizes. 24" and 36" would they be able to live their whole lives in a 24" or should i go with the 36. Now this wont be for a couple months. And also with a uth on stackable enclosers... they would still be ok to use even though it will be heating the top of the one under it or would i need to put some sort of spacer to seperate them in some sort.