I checked my water parameters tonight on my 20 gallon and. after getting readings of 4 ppm of ammo., because I didn't know I didn't need that much. my ammo. is ZERO. ,At first the API Kit showed the water clear then yellow
. I am just stunned ! My nitrites are still 10 + and nitrates 40. I dosed the tank up to about 2 ppm ammo now. When it comes time for a water change to bring the nitrates down. how much of a water change? Thanks