I have recurring issues with high nitrates in my tanks. I have tried Vodka, vinegar and sugar as carbon sources for the bacteria with varying results from each. I just can't seem to get a handle on it. Looking for a better carbon source and just wondering if anyone has ever tried any of the "Planted tank" carbon sources like API CO2 Booster or Seachem's Flourish Excel as a sorce of available carbon for the nitrifying bacteria. Just a thought I had. Thanks in advance.