i owe you .02 then.
nitrite -> nitrate is a hypoxic action though
nitrate -> N2 gas requires the anoxic environment
while this is only technicalities, it doesn't realy affect our tanks, ... what we're told of the nitrate cycle is really textbook overly simplified, it all depends what bacterial cultures have taken residence in our tank.
ammonia -> nitrite
nitrite -> well depends what bacteria is present, turns it either into ammonia or nitrate, if ammonia you've got a self-feeding loop till more of the bacteria that turns it into nitrate is present
nitrate -> ... well once again depends on the bacteria, and sometimes ammonium comes about. so things start to get really messy, ... so much for the text book
but things do eventually make it back to Nitrogen gas
enough of the unimportant stuff though.
i haven't look at the cyano bacteria, ... call it a major oversight, it wasn't in my tank so i didn't care to look into it. wasn't an algae i payed it even less mind.
that's definitely something i've gotta look into now though :), find out more of what's going on :)
i like new directions of inquiry :) thanks :)