My Nitrite was really very high, one of my glo fish died. So I did a 25 percent water change, and now I have no Nitrite. My question is, should I check every day, or every few days, or every week? I do not want anymore dead fish. My betta fish tanks, there is no Nitrite I was talking about my 40 gallon tank, but after the water change it fixed the problem.
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