My husband put down a homemade substrate mix when we had humidity problems. A thin layer of aspen, then some coconut husk, the sprinkle a little bit of that sphagum moss stuff. Also we took a tshirt, sprayed it with a little water (not too much just mist it a little) and put it over the screen next to the lamp (not too close we don't want fires xP). Tha stuff has our humidity good, and we were having a hard time getting it up with thefoil trick. Also make sure you have the lamp over a water bowl, always helps. Hope this helps ya =]