My routine to test my cycling tank every evening after back from work, Today, I found my Nitrite already show up after almost a week. The reading:
pH 7.0, Ammonia 2.0, Nitrite 0.25, Nitrate 5.0
After I did the WC the reading:
pH 7.2, Ammonia 1.0, Nitrite > 0 and < 0.25, Nitrate 5.0
2...