I use 3 Fluval 307 canister filters on my 60g. I have a 4" Flowerhorn. I fill 3 trays with BioHome SuperBio Gravel per container, 6lbs per container. Only 18lbs for 3. I leave the sponges in the left tray for mechanical filtration. I lay down a light layer of Polyfiber .Floss up under the inlet/outlet.I've found my nitrate levels to be consistently around 10ppm.For this to help control nitrates you need a lot of this stuff, not what their website recommends.Highly recommended .
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