The size of the cage isn't a problem perse, but you still will need to set the cage up in a fashion suitable for a young cham. Larger cages have larger temperature gradients, this can be the challenge when placing a small cham in a large area because it limits your control of variables. So, make sure that the distance in relation from basking perch to lamp is appropriate and that there are plenty of options for sitting in the enclosure. I like to have a horizontal branch every two inches in my enclosures so they can thermoregulate more efficiently. It is also going to be more difficult to keep your humidity on point for the little guy. Pack the enclosure with live plants....pack!!! This will help tremendously. If the task seems to daunting, you can always section the enclosure off. Create a make shift bottom so you only utilize the top half of the enclosure. Just remember, the smaller the area, the easier the control of environment. That's why smaller enclosures are usually used at the beginning and then upgraded throughout the growth cycle of the chameleon. Good luck!
