Easy upgrade to Fluval 307 filter for CRYSTAL CLEAR water and FEWER water changes

The fluval 307 is a great filter out of the box, but, lets bet honest... it's not living up to it's full potential. The media it comes with is lackluster and - are those particles I see floating in your water?? Here's a couple inexpensive and easy upgrades to improve the heart of your freshwater fishkeeping system; your canister filter.