I run BioPellets to reduce my nitrates because I have a fairly high bioload in my 150g. Without the pellets my nitrates would hover around 5-10. With the pellets my nitrates are undetectable. Probably not zero, but undetectable by any test kits that I have.
Also, I have always run GFO in conjunction with biopellets. GFO to reduce phosphates because BioPellets don't really handle phosphates all that well.
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