Hey guy's I have a question about my water, my readings are: NO3 is at about 30, NO2 is at 0, Total hardness is about 400, Total alkalinity is about 240, and PH is at 8.4, how do these look. I am a little worried about my NO3 I don't know why it is this high, I even did a water change and it is still the same, and I use RO water. Can someone please help?