It's a false bottom. Here's how I set it up: There is a square of PVC pipes at the very bottom. I laid mesh (drawer liner) on top of this, and on top of the mesh there is Eco earth. The moss on top of the Eco earth is "frog moss" by Zoo Med. There is a pump at the bottom, with a tube attached to it. The tube goes up through a hole cut in the mesh and up through a hole drilled in a rock that sits on top of the Eco earth. When the pump is turned on it acts like a natural spring. The water is pumped up through the hole, flows down the rock, and soaks back through the Eco earth and mesh to start the process over again. As for the plants, the large one is a pothos. I'm not sure what the other smaller one is called (other appropriate choices would include Chinese evergreen, philodendron, arrowhead, and bromeliads with no spiny edges).

I take everything out of the cage and give it all a good cleaning once every four months. Should I do it more often (I clean the cage decorations once a week)?

P.S. In the second picture you can find both frogs hiding if you zoom in. (Hint: There's one in each plant.)