Probably will combine their cages. They aren’t bothered by each other, I’ve got pictures of them side by side.
Chameleons are really good at hiding the stress of sharing a cage...much of the time it will show as an illness.
The basilisk might be happier with wider branches as well.
The chameleon would be good with ones that are not too thick as well as a couple that are wider.
What is dividing the two halves of the cage?
I had a basilisk a long time ago...but a different kind than yours.
I started keeping chameleons over 30 years ago. All I want to do is help you with your animals because you seem to love them.
We still need to work on the eyes.
What is the UVB light you're using?
Does the chameleon ever get outside?