I put this filter material in my old Fluval 205 in a 28 gallon aquarium with more fish than I really need and my tank stabilized after a week and then had great results after 2 weeks. I watched a video of Pondguru "pumping" a Fluval 206 filter and practically did the same thing with my 205. The results speak for themselves. I have 7 Angelfish small to large and Clown Plecostimus all in this tank (yes I know too many fish but I'll fix that soon) and the filter works great to keep ammonia zero, nitrite zero and nitrates are about 10 parts per million. I couldn't be happier with these results!
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