I use aspen,keep a majority of my tank covered with a wet/ damp rag.. I also have a tup o ware container and filled it with sphagnum moss wet it down and placed it on the warm side,since my water bowl is kind of center of my tank just a little more towards the cool side...mist in the morning when I wake and again before I go to bed and I never have problems. If u are worried get a pond fogger or a humidifier,set it on a timer and that should help.