Maybe not mythical, but I am trying my darndest and I can't get to 0. I may have to add a fuge to do so.
5ppm seems to work well for me, aside from the slight algae that grows on the glass that I need to clean every week or so, no big deal.
I think people need to realize that the target should be 0 NO3
, but it is not the end of the world if you don't get there. Everyone's tank is different, no matter how you try to emulate others on this board. Some will get to 0ppm and others will stay b/w 5 - 10 doing the exact same thing the other guys do. No matter how you try to eliminate them, there are so many variables between tanks that all you can do is get to the best you can for your critters. As long as there is not an unhealthy level for what your tank is supposed to be, i.e. FOWLR
no anemone or FOWLR
with anemone, etc. Go for it, have a good time and quit stressing.