In my reef tank I was having trouble with my lack of nutrients. The colours on my sps were pale. I started adding nitrates to get my nitrates up to a readable amount on my Redsea Pro nitirate test kit and I unfortunately crashed my phosphates. I lost about half of my corals and it took me several months to get my tank turned around.
What I have found I have to add both potassium nitrate and potassium phosphate twice a day (will be setting up to a doser) at a ratio of 3 to 1. I still can't get a measureable amount of nitrates but I can keep my phosphates at a good number. To my 75 gallon tank I am adding 6mls of KNO3 daily. I am slowly increasing the dose to try to get my nitrates to a measurable amount. The colours on my corals and the growth rate are better then they ever were before.
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