@hart24601 is another reefer like @2Sunny See post 8 who has amazing tanks packed with beautiful coral that most any hobbyist here would be jealous of, and near "zero" on the testable nutrients.
Hart, my impression was that you already had high rate of food going through your system, many small frequently eating fish etc.
Would be interested in your thoughts / observations. Do you think that your tank already had a high rate of feeding and Nitrogen flux through the system and that NO3 addition still helped? Or do you think that NO3 addition at the time was filling in a gap due to not enough feeding / fish for your coral appetite?
On my old tank I had auto feeders going 6-8x a day plus feeding frozen and nori. I think it’s important we keep in mind we can’t paint every system with the experiences of a few people, different systems can be drastically different on live stock and how they process nutrients. That’s why I chimed in with my experience just to have another data point. I was also dosing nitrate when I won the acro growout here on 2r2 in 2014 I think it was and I spot fed all the corals every single night in addition to the food and still had to add nitrate for color or they paled. Now I don’t think most systems should need this, but I also don’t think people should exclude the possibility of needing it.