Interesting because my nitrates are always very low, under 3 when I test. I think mostly due to my large water volume, still low bioload, and I have a ton of dragons breath growing in my sump and display that is sucking the nitrates up. I’m up to 9 fish, all under 3 inches at the moment, and soon to add 2 more and that’s about it. Most of my corals are small as well. I try to feed on the heavy side. I get about 1/4 inch of dark green skimmate out of my reefocto skimmer everyday though so I figured the water isn’t all that clean. I feed live black worms and formulas 2 flake. I have 3 Pygmy angels, a long nose hawk, flame hawk, tiny yellow belly regal tang, blonde naso tang, yellow tang, purple tang, just lost a sailfin from QT but may try one more, and have a powder blue in QT that’s is going to be the last fish I put in because he’s nasty. Lol. Maybe I’ll shut the skimmer off for a day or two. I still get some diatoms on my sand though so I figure there’s stuff in there, it’s just being used by the tank life. Tanks is only about 6 months old too, maybe that still playing a part in this.