Imo I wouldn't even bother with a heating pad. It will lose all its efficiency on the side. What I did was grab a dome 150w clamp on work light from home depot $7-$8 along with a 75w std household bulb. You could probably do a 50w as I have a 20h tank. Just make sure you pay close attention to the distance from the top of the tank so you dont get it too hot in there for it. I mist 2-3 times daily to keep humidity ideal. Also I would put it over the water bowl side and use plants to shade the light so its not so bright. My 2c