Hi. I am hesitating which one to buy. I am afraid that TNC Complete could spike my nitrates but it is much more condensed and contains nearly 4x more micros than Ferropol. While Lite just 2x more than Ferropol but both don't contain nitrogen. Ferropol seems to be thinest in ingredients. This is my reading... Right is tap water, left is tank water after a week from change.
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