Kaden,
A panther chameleon old enough to be sold is plenty old enough to be in the largest cage you can get. In fact, I keep my hatchlings in 48” tall cages if I can, but I’ll try to keep my trouble-stirring ways under wraps here!
Set up the cage like you would for an adult. With a Large Atrium you can fill one side with plants to offer hiding places and a humid, leafy retreat while the other side is open, has the basking area, UVB and the feeder run cup. The mister sprays the plants and you have a nice environment where the chameleon can find anything they need. Do not worry about two basking areas. Your chameleon will actively search for what they need - be it food, water, shelter, or heat. They are great at taking care of themselves. All we need to do is provide all the things they need somewhere in the cage. Though with the basking lamp I suggest getting a wide reflector and mounting it high above the cage so the heat is gentle when it gets to your designated basking branch. They may be ready to take on the wilds of Madagascar straight out of the egg, but they are still little bodies and it is easy to over energize them.
The only other special consideration i would make for their first six or so months is add in thinner branches in addition to the normal adult branches. These can be removed when he grows up a bit. The thinner branches will give his little feet an easier time. Of course, they always find a way if they want thinner perches.
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