I have been dosing 1/4 teaspoon on Sundays and by sat they would be down to 0. I had bga a few weeks ago do I did a blkout and started dosing twice a week to keep the nitrates up. I would test before and after just to make sure everything was in line. Last wed I dosed, added the plants and fish on thursday, nitrates jumped on friday.
With that being said I think my test is ok, but I will take my water in tomorrow to be tested to make sure. I will do another water change also. I don't know...maybe it will be fune then?