I finally got a bit of a nitrite reading, which, after weeks of high ammonia readings, I think means that my tank is at its final stage in cycling, am I right? How long does the nitrite spike last? It is only 0.25 right now. Ammonia is high, but I use that Ammo-Lock stuff which I hear throws off the readings. Anyway, just wanted to know how to handle the nitrites, constant water changes or let it run its course?