I'm dosing with a neptune dos that adds no3 and PO4 to the tank every 10 min. I have checked levels through the day and they are stable (I was concerned about the difference between night and day). When I first started dosing I was doing it by hand in the morning and evening and since I needed about 20-30 ppm for no3 and 3-4 ppm for PO4 I was having to raise the levels high then let the tank use it up. This was causing algae issues and my corals didn't like it. Since I put it on the dos everything looks great and my levels are consistent
Why do you want phosphate and nitrate so high