Thanks for all the tips guys! I changed the setting on the dehumidifier to 35%. I also sprayed the areas that had mold with a bleach mix to kill it. This weekend I am going to remove the shelves, gun racks and the NFA safe and seal the inside with Drylock sealer. The nice thing with the Drylock is it is white, so it will brighten it up in there. Just changing the setting on the dehumidifier has made a noticeable difference in the air quality. I don't know where I heard that the humidity should be as high as I had it. Live and learn I guess!