Water column NO3 excess can be solved by adding essential plant elements assuming there are plants and the rest by denitrification. Denitrification can be done by filling a canister filter with BBQ lava rock over one inch in diameter. This can remove several ppm of NO3 a day while not changing other water parameters unlike the materials in the video.
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Last edited by Edward; 12-29-2017 at 05:48 PM.