This might work just as well and be a lot cheaper (29.00). A friend loaned me two of these, and they were great to use for raising lots of Pipevines before I got so overwhelmed with caterpillars. I kept Monarch butterflies in these until I could release them at one of the local Relay for Life meets. The Monarchs made it two weeks. I set up lights on top and put bouquets of nectar plants in the bottom. They break down easily and set up quickly. sandy Here is a link that might be useful: Butterfly terrarium

your best bet for PDF Vivariums would be to use soil; super soil is great as it's just that, no perlite or anything toxic or dangerous, also, milled sphagnum peat moss; this lowers the pH for that nice moss action and also hold water. use sand to make soil drainable. you should want to establish the nitrogen cycle which will do a few things. one, help break down waste and two: feed the plants. also you should be sure that your soil doens't come with animal waste or wormcastings. if you opt for repti-bark or other off the shelf products, save your money instead. research soil mixes by looking at google.com for key words: Naturalistic Vivariums" also, i've been adding to the soil a single layer of oak leaves. i wash them very good of course. they have tannins that help the soil, and some PDF's just love hiding and breeding in the liter. what species are you interested in?

How old is the gecko? Is it definitely male? What kind of substrate is in the cage? What kind of lighting and heating does he normally have? Is there calcium supplementation of any kind (gut-loaded crickets, "shake and bake" feedings? Is there water always available? What else is in the cage?

Second is one of the maidenhair ferns? Image is at a weird angle.