My nitrates were at Salifert zero so I raised it, but accidentally to high. The nitrates went from zero to 50ppm which I believe caused my Monti to bleach. Once I got the nitrates down to 25ppm the monti recovered. I have another monti that started to bleach from I believe being stung by a favia coral that I moved into a corner. It is now recovering. I would like to keep my nitrates under 10ppm. I am now below 20ppm after a four gallon water change. I am thinking that the nitrate spike caused the rock to absorb some or a lot. Perhaps the rock is releasing nitrates into the water. Would adding a small piece of macroalgae into the tank be a good idea to reduce nitrates? Below is a video of my tank. Change the quality to 720. Thanks to you all