I've been struggling with nitrates in my 75 gallon tank for over a month now with no success. I was about to lose my mind because the nitrates were around 80ppm and I was losing fish almost daily. Last weekend I cleaned the external filter, put in half a liter of denitrate and did an 80% water change. I've now lost 3 fish due to the permanent damage already being done, but now a week later my nitrates are halved and all the remaining fish are fine. This product was a lifesaver! I made the mistake of putting denitrates directly into the baskets in my filter and some of the particles were so light that they were sucked through the filter into the tank and almost destroyed the propeller. So I had to take the filter apart and put all the denitrate in a media bag. Otherwise, however, this product performed better than expected and is highly recommended.
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