One additional thing that is rarely relayed, is the analysis they did of the Nopox was lower resolution, it was a quick test, and it was student operated vs a seasoned professional. Though those points are debatable, it goes to say as well that Nopox is not just acetic acid and ethanol. There's also methanol and the test shows a bump in the isopropyl range iirc. I've not looked too far into the isopropyl tangent and it's interaction with bacteria/fungus/etc. But methanol alone is also used for denitrification. There's organisms from fungus to bacteria that utilize it and nitrogenous sources to carry out similar duties. It's not really been investigated in the hobby collectively as to its extent, but in wastewater treatment it's got the efficiency of other carbon sources with different interactions. If you would care to look up more start with methylotrophs. It's very diverse on the amount of organisms. So as much as people suggest the ethanol is only denatured and the methanol is a side effect, that simple statement along with "Nopox is just vodka and vinegar" ignores a vast amount of information including the simple premise of reading the label that says, "Contains Methanol".
Another tangent to look at would be a newer one to the states called NP Pro by Aquaforest. Unlike Nopox, zeovit, and vsv, users report it has no odor and is clear. So after time goes by, depending upon what's reported, it's efficiency may rival even the best current methods. (so far the tanks I've seen look pretty darn good, and Imo beat vsv hands down, but it could be a different aspect because bacterial dosing is part of the program and not all vsv users dose bacteria)