As I need to put my baby balls in a smaller enclosure first,I was wondering if a 20"x20"x20" would be enough for two babies.
Up to what age/length could I keep them in there?
Thank's a lot for your advice,I appreciate it very much

Jacky that will be fine. I started out my pair in a 10 gallon tank. That enclosure will last them a while, depending on how fast they are growing.
When they get about 1/3 longer than the length of the enclosure its time to move up!

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Merlin,
What's Life Without A Little Magic!

OK,thanks Merlin.
Now I just thought of something else:how do you keep the diffrent temps in such a small enclosure?As I use styrofoam terrariums I only use bulbs for heating,because the styrofoam warms up as well,but as this is quite a small enclosure,how will I keep one side cooler than the other?Or could I just put the lamp just on one side?How do you do it in your tank?

You put the lamp on one end of the tank.
I used a human type heating pad under one third of the tank. this gave them a warm end and a cooler end.

__________________
Merlin,
What's Life Without A Little Magic!

My friend's ball Akasha is in a 10 gallon at the moment since she is still a juvie. I likewise put a human heating pad under about 1/3 of the cage.

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0.1 jungle/coastal carpet python: Sheila
1.0 anerythristic boa constrictor imperator: Severus Snake
1.1 rats: Eowyn, Gandalf
1.0 ferret: Walker Texas Ranger
0.0.1 gold fish: Tiger
3.0 dogs: Strider (Aussie/husky), Zoso (Belgian Malinois), Buck (husky/Rottweiler)