so I've made the executive decision to upgrade my bio media in my planted 55. I have a sunsun 3 stage 264 gph canister filter with two of the trays full of Fluval biomaxx. It's not keeping up with my tank when the fish inches to gal ratio isn't out of limits, and I have a specific amount of food they get everyday. I started looking around last month at different media's and found MarinePure media on Fosters & Smith. The figure for the amount of surface area for one 2 QT box of spheres would be enough for my tank. Has anyone used this media yet?