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[Randy Holmes-Farley Verified Community Expert]

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thanks so much for your help yes 0.5 is where it stays is that ok for corals as well? also is this common for biopellets and why is it? and yes i look forward to your writings to read

It may just be testing error, but I would not do anything special about it except perhaps monitor it. I've not seen any data suggesting that 0.5 ppm nitrite will be a problem.

It is also not common to have elevated nitrite in a reef tank. Have you measured the effluent from the biopellet reactor itself to see if that is the source of the nitrite?