I have 2 fluval FX5 and have been using them for around 7 years and they were used. I love them. Now there are FX4 and FX6.
Also agree about doubling the amount you might need for your tank.
Reason is once the media is in there, GPH
are reduced, and used for awhile the GPH
are reduced more, but usually Fluval has a better GPH
than many other canister filters. They have been good to work with over the years for customer service. All of my filters are Fluval or AquaClear.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves