also crumble up some newspaper and put it in the tub, spray it down really good with a spray bottle and your problem is solved. I use this trick on all of my racks with paper type substrates, I always have condensation, and I always have perfect sheds. I either use packing paper or newspaper on my racks unless I am using coconut husk...I use paper though in my racks almost all the time. even when I use the white packing paper as the bottom layer and substrate, I always have crumpled up newspaper. I only have to spray every two or three days to re~moisten the newspaper. works awesome.