Hi, I happened to stumble on your post and I have a question and some suggestions: why are you adding a acid/ alkaline buffer to the tank? Wouldn't this render your C02 readings useless? Now there is an alkaline buffer (white powder) that adds to the KH (alkalinity)- this shouldn't cause a problem because it's really just baking soda, which many here use to raise their KH without a problem, but if your using acid buffer (the red/pink granules) then you may have less C02 then you think. Also Don't even think about adding more K. THere's more then enough IMO- like you said 65 mg/l for each dosage of equalibrium. "Flourish" is a trace mix I've been using it for the last year on my tank as a trace and it does the trick. If there is a "flourish trace" I can't find it on their website. If you are not dosing any Phos. then dosing to 1ppm will definately get you closer to success. Unfortunatly I can't say how much to add because I never really used it, but like anything start with the recommended dose and go from there.