The Fluval FX series stands for high-performance and reliability. Made in Italy, the FX4 canister filter is a compact counterpart of the FX6. FX4 is suitable for those upgrading from Fluval 406. Fluval FX4 is recommended for both freshwater and saltwater aquariums up to 1000 L (250 US Gal).
Fluval FX6 is a high-performance external canister filter for both fresh water and salt water aquariums up to 1500L. Has an astounding filter media capacity that produces the cleanest and healthiest results ever.
This filter media has a "Thin Bio-Film" Open Pores design that allows flushing of old dead bacteria film, minimise clogging within the media and ensures beneficial bacteria grow quickly within the media to efficiently remove ammonia nitrites from water.