I was just curious to what everyones nitrates usually read when they test. I feel that I keep my tanks very clean.. Not as much as could be. But I have over filtration on everything and do at least weekly water changes. Probably more like every 5 days. Should my tank be zeroed out in all three Amonia,Nitrite, and Nitrates. I know you shouldn't have amonia and Nitrite for sure but do you all get zero readings in nitrates as well. Mine alway seem to be between 20-40 ppm.. Thanks