I have to agree with you about the peat moss. I use a coco-fiber type material I get from a local hydroponics shop near my place and have been having great success with it. I add some orchid bark to the mix to give it more consistency and love it. I have a lot of good breeding from my U. ebenaui with it. I also use filtered water with all of my animals. I can not say that its been a noticable difference when it comes but it works. I also bleach all of my cage wood when I get it because I collect in the San Gabriel Mountain range out here in L.A.
But UV light seems to be the best for me with solving mold growth issue.
cheers,
boy