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I run the original Eheim SUBSTRAT Pro Biological Filtration Media and have just recently started to mix in BRS Bio Pellets in the canister. I havent noticed a major change in nitrate since I put it in. I used to have 20ppm and they dropped to 10ppm and have not moved since. I will be ordering a reactor next month and some GFO and ill see how that works out for me.
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