Everyone is correct on the point that all tanks are different, but what your missing is in fact exactly how much vodka it takes to take care of a certain amount of nitrates, thats not going to differ. It takes a certain amount to rid the tank, and if you even set up and just change your dosing my 1ml a week, your going to be at it for a very long time, trust me. Not many people get away with just dosing 5mls a day, in any tank, unless you only have a 29g tank. And you also read that people give up very easily, thats because following the normal graph, it will take forever to get the Trates to fall, or I should say, enough bacteria in the system to make an affect on them.