Yeah, I dose vodka as well. The online article (from RC, I think) says that you should dose .1 (point 1) ml per 25 gallons of water, per day. That's actual water volume, not just tank. So a 75 gallon usually has about 50 gallons of water, so the daily dose would be .2. Do this for one week, then increase by .5. Increase each week until n and p start dropping. Once they reach zero, cut dosing in half, that will be your regular dosing regiment. Adjust as needed.