the co2 bottles are underneath the tank, and go through tubing and out through an airstone. it is producing tiny bubbles constantly. my other tank, which has better co2 levels (but very little surface agitation), also has "bells" over the airstones to catch a maintain a constant co2 bubble in contact with the water. we could add those to this tank too. and no, there is no way to lessen the waterfall - we have the water level as high as it'll go.
so add 2 cups of sugar, 1/4 teaspoon of yeast, and say 6 cups of water? will try that one on our next mix, thanks.
good article, thanks for the link! i would assume that the limiting factor in this tank would be carbon. i thought it might have been phosphorus too, looking at the green spot... but the phosphorus test i got recently seemed to think i had 0.5ppm?! so i have no idea. it's all getting out of control, i think i will just continue and see how time takes it.