Weren’t your NO3 around 40ppm? How did you get it so low?
Do you use a refugium/algae scrubber.
Nope, I lower my numbers by feeding

. The concoction that I’ve made is the main driver
Do you find a color difference with nitrate levels? I’ve been keeping mine elevated above 30 and found better coloration but could be other factors as well.
There has to be nuance to this answer, on the surface a nitrate test value is an indicator of the systems ability to process nutrients. A system that has a value of 0 ppm can have the same coloration as a system that had 40 ppm. But then you also have to look at this scenario holistically and examine the feed input into these systems and lengths that these systems take to remove nutrients.
So a tank that can process nutrients and maintain a value of near 0 N and P is an indicator of two potential things.
1. Equilibrium, The system is at a steady state where the feed input exactly matches filtration output
2. The system is nutrient starved, The feed input is insufficient compared to the filtration output.
You’ll be able to gauge which scenario you’re in by examining your corals. If they are starved, it is very visible.
A tank that has 40 ppm nitrate can also grow colorful coral, but is an indicator that the feed input outpaces the filtration output. We also have to remember that high nitrates can negatively affect our water quality and growth rates as well.
I have been on both ends of these extremes with Ultra Low/High Nutrient Systems and I can say that it more about the overall husbandry of the system than a number. A number can only tell you so much about the biology of the tank.
Long story short: High or low nutrients, doesn’t matter. It depends how you treat your tank
I'm just now joining this thread. At what post can I find out what "this method" entails? Its enticing!
Go back and keep reading!
This video should explain the core ideas. Trying to culture the concoction requires an ultra sterile environment. If you can’t ensure that then I wouldn’t recommend it long term. Mix and use within 3-5 days, and if it looks and smells off in any way toss immediately and reset if you want.
Currently innovating the method so it doesn’t have these pitfalls.