He is closer to 7 months right now. I have weighed him consistently since I got him and I am sure on both the weight and age. He was the largest in the clutch when I picked him out. At 4 months he weighed 50 grams so he has put on nearly a gram a day since ive had him.
If your room doesn't dip below 50 degrees then you are fine. I would only worry if it got cooler than that. Their natural habitat regularly reaches 50's and even 40's at night. So if you are in the 60's, you are sitting pretty.
Here is a link that provides the highs and low's for the...
Everything about your husbandry seems good except the red heat bulb. Chameleons need a slight temperature drop at night. And the night bulb could be keeping him awake at night which in turn could be contributing to him sleeping during the day.
You may view it as a gimmick but I endorse it. I no longer have to use a dripper or worry about drainage. My cham stays properly hydrated with less effort/maintenance on my part. I see him use it every morning and I now only mist for humidity.
I've been using one for about a month now and I love it. I have seen my cham drinking out of it several times so I know he likes to use it.
Like you mentioned, the water does get warm. Although I am not sure whether its the pump or the basking light. I keep my Cantina mounted up high so it...