oops I said nitrate once when I meant nitrite. Nitrite is much worse than nitrate. I read post after post of people who get 0 ammonia, think their tank is cycled, go add fish and suddenly have floaters. You must test for nitrite up until 10 weeks in a new tank until you see it drop to 0. You can have 0 ammonia and still have killing nitrite levels. If you are cycling with bio-spira or stability or even scrum from an established tank's filter, when you start having reading nitrite, add another dose.
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