Yup, has a false bottom to accomodate the waterfall. The waterfall is the most difficult part of the whole setup. It has to NOT leak anywhere, which requires testing, testing and more testing before any substrate goes into the terrarium. Even after the substrate's been in place for 3-4 weeks, I find I STILL have a small leak into the substrate portion
Wish I had taken lots of pics during construction to show how I did it all.
Anyway, substrate consists of one brick of CocoEarth soaked in RO water to expand it and about two cups of worm castings. Bought all the hardware and substrate at a local hydroponics store.
The false bottom is made of eggcrate from Rona. Lego supports the eggcrate. Landscaping fabric goes over the eggcrate so the substrate doesn't go into the water.
BTW, all of the rock is mounted with silicone on pieces of glass.