NEW Fluval 07 External Performance Canister Filters -. Fluval FX2 External High Performance Canister Filter -. Fluval FX4 High Performance Canister Filter -. The FX4 bridges the gap between the Fluval 406 and the FX6 canister filter, making it an ideal choice for aquariums up to 250 US Gal (1000 L).
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