I've never seen a white film on top of the soil. When I did find mold you couldn't see it on top of the dirt. It was around the nut in a cluster of dirt and mold. I just went out in the garage and pulled a tray and took two pictures.I'll post pics tomorrow, but I looked today and there is NO moisture on the side walls or the lid. Also looked like the was a slight white film on top of the soil. That doesn't appear good to me. I'd like your recommendation after I post pics on what to do. Thanks again!