Is it possible to have bacteria that convert No3 to pure nitrogen? As my tank goes through Nitrogen cycle. It goes very well. I would put plants by now but because of various reasons I didn't. Lately though, after dosing pure ammonia, it goes through the regular stages (ammonia, nitrite and nitrates) but when I test nitrates they are very low to 0 when I expect them to be much higher. Is it possible I developed bacteria that also convert NO3?