A picture of setup can help us or a description on how it looks. Picture is better though. Well to begin, live plants are the best way to keep humidity. You can also do your own living wall plant. That also helps. Also you spoke about humidifier vs mister, Me personally I would go with mister. A couple sprays through out the day. Can help you stabalize your humidity. If you go to mistking.com you can get the starter kit for $100 bucks. plus if you get a humidifier your cham wont be able to drink water cause its a humidifier. As for a mister it gives water for your cham to drink and the live plants help stabalize the humidity in his home. There is also aquazamp.com they have there rain dome. The rain dome makes it look like it raining its pretty cool. But if you have more than one cham then i would go with mister. Hope this helps im sure there will be other members to chime in and help you out.