Do these have minimum humidity settings? The humidity levels in our entire apartment bottomed out last winter and it was sometimes only 20-30%, which sucked for dry eyes and mucous membranes on humans (didn't have frogs back then). I'm worried the same thing will happen this year, it's already as low as 40% humidity and I'm having to mist my new WTFs more frequently, but White's like the humidity about 50-60% and shouldn't be kept higher then 70-80% for any length of time, when not breeding them, so want to make sure it doesn't get too high.