Designed for aquariums up to 400 gallons (1818 L), FX6 is the high-capacity workhorse of Fluval's canister lineup, enhanced with all the power and reliability you've come to expect from a high-performance filter.
Key Features :
Multi-stage filter pumps out an astounding 925 gallons (3500 L) of water per hour
Improved motor technology provides better performance while consuming 10% less electricity than previous generation 
Smart PumpTM - advanced microchip technology continuously monitors and optimizes pump performance 
Self-starting - just add water, plug in and Smart PumpTM will take over. Trapped air auto-evacuated every 12 hours to ensure maximum efficiency
Easy water changes eliminate need to carry heavy buckets. Simply attach hosing to output (Kit sold separately) and Smart PumpTM does the rest
Removable, stackable media baskets eliminate water bypass and hold a total of 1.5 gallons (5.9 L) of media
All filter media included - mechanical, chemical and biological
Aqua-Stop valves with leak-proof Click-Fit attachment system
Valves positioned at convenient 45-degree angle for easy installation and rotation
Anti-clog, telescopic strainer ensures continuous water flow
Multi-Directional Output nozzles can be fully adjusted to create customized water flows
Purge Valve with drain hose for easy maintenance and flushing of canister
Rubberized feet help ensure quiet operation 
21" tall design - easily fits under most aquariums
Made in Italy 
For use in freshwater and saltwater aquariums