OK here we go with step one of the experiment. It looks as though the Green Water is fairly well established. There is also a nice amount of Blue Green or some other type of sheet type algae in the tank. It doesn't look the same to me in sunlight as it does in flourescent light. If you look close at the pic you can see the algae seems to be pearling after 4-6 hours in direct sunlight.
Today I added 162.5mg of Aspirin to my 10g (38L) tank. The Aspirin was crushed then mixed with about 100ml of water. If I calculated correctly this should give me 4-5 ppm of Acetylsalicylic Acid (one of the chemicals in Willow branches) in the tank. IF someone else is more chemically adept than I, feel free to verify my calculations
IF this has no effect on the green water, I will add another 162.5mg tomorrow. Here is a pic of how the tank looked about 15 minutes ago