true dat F6! O2 is reactive as hell as is, O3 is worse!-- as free radical, it's a chemical wrecking ball basically!....
....One can always hook up a foam fractionator too and make some protein scum to top the Vegamite with!
.... my understanding is that NH4+ is more likely to cause foul smoke than NO3-- because of how and what it's stored as,... These two forms are the only ones plants can absorb, NO2-- is just toxic and/or useless,.... it's up to the right 'crobes to convert that to NO3--,.....