I was having a problem with my tank so I switched to two UTH's from one UTH and a bulb lamp, switched from aspen to paper towel and put a large water dish at the warm end of the tank. My humidy went from 35-40% (at the highest) to 55% immediately and has stayed there. I also cover the top with a towel. With daily misting I can easily get it to 65-70% and keep it there for shedding.