I thought that maybe he needed bigger branches since he has grown a lot since this was first set up. This morning he is on a lower branch. Maybe these just aren't so stable anymore due to his size. I will make sure to get more stuff towards the top of the tank. Right now I mist him just one time a day, but I'll increase that and also mist everything inside the tank.
What is a good nighttime temperature for his tank? Thanks for your help!