[reefgeezer]

I made a solution of 100 grams of potassium nitrate (Specrticide Stump Remover) with 500 ml of RODI water. 12 ml of this solution raises nitrate levels in my ~100 gal system to somewhere in the 2.5 to 5 ppm range. I just can't pinpoint it any better with my Salifert kit.

Without carbon dosing, the nitrate stayed in the detectable range for about 10 days. Unfortunately that doesn't help my phosphates. I'm trying to figure out what to do. The phosphates remain low without using anything, but they are slowly rising. A few days ago they tested at .08 ppm. That's the high end of my target range.

I'm currently not confident that I can SAFELY dose nitrates and then use carbon dosing to remove it and the phosphates.