Those test results look familiarI’m far from 0, haha. A month or so ago I was close to 50 ppm. I have been doing water changes and growing chaeto to reduce that number and I think I’m about 15ppm now with po4 at .11.
I never in my wildest dreams thought I’d have numbers like this but it has showed me it’s not something to be feared and it doesn’t cause brown corals.
Here is my test when it was near that 50 ppm and the bottom pic was tested yesterday.