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HELP - High Nitrite (NO2) reading

Nitrite (NO2) ppm (mg/L) = 3.0-5.0 (Stress to Danger)



I have a 300 gallon Rubbermaid tank outside and it has a heater which keeps
the water temperature around 40-45 F even if it is freezing (~32F).  I also
have the regulat filter/pump running.  I stopped feeding the KOIs about 1.5
months ago.  I test the water and it shows the Nitrite is high {Nitrite
(NO2) ppm (mg/L) = 3.0-5.0, Stress-to-Danger}.  What is the cause of high
Nitrite and should I worry about it or do anything to lower it?



Thanks for any help,

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