Im having a hell of a time keeping my humidity stable at 80. Can it range at either side to say 75 to 85 or does it have to be 80 full stop. I have my water thingys full, I have a face cloth dipped into either water well using it as a wick and it keeps dropping to 70. I didnt have a spong, but I do now, stripped the sponge off a mini paint roller and put a bit of water in a container and the said sponge. We will give it a while to settle down then see what happens. Once I find a happy medium I will be happy