I use disposable cotton cosmetic rounds and squares as substrate. They are very handy and easy to change out. I also use faux flora and, in my chlorophaea tank, there is no substrate. My question is this: How do those beautiful, authentic terrariums stay clean? I mean those leftover crik parts are smelly. The location of my enclosures demands that they be odor free, and they are. However, I'd like to grow some orchids and maybe have a nice, front opening enclosure. I just can't see how moss and soil can stay clean and odor free. So, somebody who has a more natural approach tell me how you do it.