Basically, we used the eggcrate stuff to build a fase botom, so it's 4 sides and a top to make a box with the bottom open, just tall enough to clear the tiny fountain pump, held together with zip ties and then covered with screening. Its smaller than the bottom of the aquarium by about 1" all the way around. Then we filled in all the way aound the sides of the false bottom with pea gravel, then covered the top with a layer of charcoal and then coconut fiber. The pump has a small tube sticking up through a hole we cut in the screen and then there is a hole drilled in the cork bark for the waterfall, with another piece of cork bark on top to baffle the flow.
To make the pool, I cleared an area all the way down to the false bottom and laid down a circular piece of pond liner, then filled it with small pea gravel and lined the edges with river rocks to hide the pond liner.
The tank has about 3" of water in it, filled to just below the coconut fiber.
When I can no more stir my soul to move, and life is but the ashes of a fire
When I can but remember that my heart once used to live and love, long and aspire
Oh, be thou then the first, the one thou art, be thou the calling, before all answering love
And in me wake hope, fear, boundless desire.