Fluval External Aquarium Canister Filter FX2 FX4 FX6 Fish Tank Filtration
Fluval FX6. Fluval FX2. Fluval FX 2/4/6 External Aquarium Canister Filters. Fluval FX4. The Fx4 bridges the gap between Fluval's famous 406 and FX6 external filters as the FX4 is suitable for aquarium's up to 1000L.