The largest canisters are rated for tanks of 160 to 400 gallons, but their media space doesn’t grow as fast as their ratings. On a tank near the top of a filter’s rating, a second canister or a sump is common.
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Full ranking 7
- Fluval FX6#1 of 7Full review
The flow king for very large tanks, at the lowest cost per rated gallon. Many owners pair it with a second filter on tanks near its rating.
Amazon $406.99$406.99Up to 400 gal925 gal/h5.9 L - EHEIM Professionel 4+ 600#2 of 7Full review
A premium square canister for tanks up to 160 gallons, with lots of media and thoughtful maintenance features.
Amazon $329.99$329.99Up to 160 gal330 gal/h6.5 L - Fluval FX4#3 of 7Full review
A powerful, efficient filter for big tanks, with a handy water-change valve. Treat the 250 gallon rating as generous and size by media need.
Amazon $337.99$337.99Up to 250 gal700 gal/h3.9 L - OASE BioMaster 2 600#4 of 7Full review
A media-heavy filter for tanks up to 160 gallons, for owners who value biological capacity over raw flow.
Amazon $334.99$334.99Up to 160 gal350 gal/h6.8 L - OASE BioMaster 2 850#5 of 7Full review
The most media in one canister here. On tanks near 225 gallons, add a powerhead for flow.
Amazon $379.99$379.99Up to 225 gal400 gal/h8 L - Fluval FX2#6 of 7Full review
A compact high-flow canister for large tanks. Its media space is modest for the rating, so it suits tanks well under 175 gallons best.
Amazon $296.99$296.99Up to 175 gal475 gal/h3.9 L - Penn-Plax Cascade 1500#7 of 7Full review
A five-basket canister for large tanks on a budget. Plan on extra circulation for tanks near its rating.
Amazon $265$265Up to 200 gal350 gal/h-
