A few weeks later, some of the plants had grown, but the duckweed, which I had hoped would have been covering the surface, were not doing so hot. I thought maybe it was that the current was too strong, so I turned off the pump so the water would be more still.
A few days later, the duckweed had indeed grown a little tiny bit better. But the water surface was now filmy. And on that surface film was a constellation of tiny organisms moving around.
I can't be sure, but under a magnifying glass, I spotted what I think were Daphnia (tiny crustaceans also known as water fleas), and tiny baby Planaria (little flatworms with triangular heads), gliding on the bottoms of the surface of the film (I had seen bigger ones gliding on the aquarium walls a few days before.) Since I was a kid, I have always been fascinated with both of these organisms. Daphnia, because as a tropical fish hobbyist I learned they were a favorite food of fish, and Planaria because of the well know regeneration properties: cut them in half and they form two new worms.
Suddenly I felt like Lisa Simpson, in the Treehouse of Horror VII segment called The Genesis Tub, where she performs a science experiment with a corroding tooth in a small tub that results in the creation of a tiny universe.
I can't wait til I've created Lutherans!