Another way to keep humidity up and I have recently tried this and it works amazing! is to get a piece of plexi-glass and just put that over 1/2 to 2/3 of the tank (if you don't feel like having it cut for you) mist and watch that humidity rise. I think I got my piece of plexi-glass for like $10 bucks at a hardware store...I tried the foil thing and while it worked, it didn't work the way I wanted it to.