Ive been having a really hard time keeping the humidity levels in my tank above 60. I think it may have something to do with the fact that the cage lid is made of bars, and theres nothing to hold any humidity or heat in. I even have half of it covered with a peice of glass I have sitting on top to try to trap some heat in, but just now, I went to the tank and the humidity was sitting at 40!

I have been spraying the cage twice a day, maybe even 3, but I am having some issues here! Suggestions?