First, a disclaimer: I am by no means an expert on mold. A few years ago I had to vacate a house due to a mold infestation and subsequent illness. Since then, I have been involved in litigation and have been learning everything I possibly can about mold, how it grows and its effects. Like I said, I'm not an expert, but my situation has impacted my life in such a way that I have had to learn A LOT! I still wish I could provide a more sientific rationale for my position, but here you go...Originally Posted by Freakie_frog
Mold grows everywhere! Without exception. It's likely somewhere in your home right now. Yes all wood contains some amount of cellulose. But, manufactured wood and paper products (wall board or Carefresh for example) have more of it readily available for mold's consumption. Carefresh especially since it's made from the stuff.
If mold had a choice whether to feed on the cellulose insulation in your attic or the 2x4's that frame your house, you can be sure it'll grow in the insulation. Mold should grow to a certain *degree* in all poorly maintained terrarium environments with all types of substrate. I would expect that it would be much worse in a tank full of pure cellulose than in a tank with aspen, coconut fiber or cypress mulch and that you would have to hange the substrate more often. Also, and I don't know where those substrates stand, some plants in nature resist mold growth and some substrates may be treated with a fungicide.