AZNO3 is something I have looked at over the last year when I had no3
issues. From my personal internet based research it appears to work *with* caveats. You should see the mfg website for those, however, used proper with a good skimmer, and it sounds like you have a good one, you should see a substantial reduction in your no3
. My battle was almost a mirror of yours (mrpope) in that I had no idea where it was coming from, only that I had it and I could not force it gone. Even after 6 - 8 months I still have a little hair algea but its not out of control as it was. I sympathize with you completely and know for sure as others here that if you work at this, you'll get past it. It seems to be something everyone in the hobby has to endure at some point..perhaps one of Nature's cruel tests of our mettle. Please do post any follow up info. We all appreciate hearing what works and what fails for others.