Here is a link to putting in a false bottom. http://www.frogforum.net/vivarium-te...se-bottom.html
The PVC is to create a base for the egg-crate can sit on. I use PVC Couplings as you'll see in the link above.
You then cover the egg-crate with a fine window screen, landscaping weed deterrent material, or substrate screen (which only comes in small sheets).
You have many choices of materials to put on top of the screen and in my drat tanks I use Zilla Jungle Mix or some of the special substrates you'll find on some of the online frog retailer's sites.
Your plants can go straight into the top layer of substrate or put into the background after the fertilized soil is removed from the plant and the plant is rinsed off completely so you don't introduce unwanted critters.
If your creating a pond area then you cut away the egg-crate from that area, have the screen and some egg-crate block off around the cutout so frogs can't get under the egg-crate and then use stone, gravel or so on to make the pond bottom.
Hope this helps.





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And then another $110 for a pump at a LFS where they sell reptile supplies. 
