I was thinking today about how quickly my ammonia dropped off during my cycling, from 5.5ppm to 0ppm in a matter of hours and it got me wondering. I'm using Nutrafin Cycle, but on the day the ammonia dropped off I had been messing about with my aquascaping, and had had my arm in the tank up to the armpit. (It's an Aquaone 620T). I was wondering though whether some of the bacteria from my under arm (the same bacteria that makes sweat smelly), could be strains of nitrifying bacteria?