Fluval FX6
#1 in Over 150 galFull 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$406.99
The Fluval FX6 and the EHEIM Professionel 4+ 600 are evenly matched, rated 3.4 and 3.4. The Fluval FX6 leads on value. The EHEIM Professionel 4+ 600 wins on media volume and features. The EHEIM Professionel 4+ 600 costs $77 less ($329.99 vs $406.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
EHEIM Professionel 4+ 600
#2 in Over 150 galFull review
A premium square canister for tanks up to 160 gallons, with lots of media and thoughtful maintenance features.
Amazon $329.99$329.99
Which should you buy?
- Choose the Fluval FX6 for value ($1.02 per rated gallon ($406.99, up to 400 gal) vs $2.06 per rated gallon ($329.99, up to 160 gal)).
- Choose the EHEIM Professionel 4+ 600 for media volume (6.5 L of media, 0.4 L per 10 rated gal vs 5.9 L of media, 0.1 L per 10 rated gal) and features (priming button or self-priming, shutoff valves, separate pre-filter, adjustable flow vs priming button or self-priming, shutoff valves, built-in UV, heater or water-change valve).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every over 150 gal aquarium canister filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fluval FX6 | EHEIM Professionel 4+ 600 |
|---|---|---|
| Overall rating | 3.4/5 | 3.4/5 |
| Value 25% | 99 $1.02 per rated gallon ($406.99, up to 400 gal) | 60 $2.06 per rated gallon ($329.99, up to 160 gal) |
| Media volume 20% | 0 5.9 L of media, 0.1 L per 10 rated gal | 47 6.5 L of media, 0.4 L per 10 rated gal |
| Turnover 20% | 23 925 gal/h for up to 400 gal, 2.3x per hour | 16 330 gal/h for up to 160 gal, 2.1x per hour |
| Efficiency 10% | 97 21.5 gal/h per watt (43 W) | 91 20.6 gal/h per watt (16 W) |
| Features 15% | 70 priming button or self-priming, shutoff valves, built-in UV, heater or water-change valve | 85 priming button or self-priming, shutoff valves, separate pre-filter, adjustable flow |
| Warranty 10% | 50 3-year warranty | 50 3-year warranty |
Specifications
| Fluval FX6 | EHEIM Professionel 4+ 600 | |
|---|---|---|
| Capacity | ||
| Rated aquarium | Up to 400 gal | Up to 160 gal |
| Pump output | 925 gal/h | 330 gal/h |
| Filter circulation | 563 gal/h | - |
| Turnover | 2.3x per hour | 2.1x per hour |
| Max head height | 10.8 ft | 5.9 ft |
| Media | ||
| Media volume | 5.9 L | 6.5 L |
| Pre-filter volume | - | 0.5 L |
| Canister volume | 20 L | 9.2 L |
| Features | ||
| Primer | Yes | Yes |
| Shutoff valves | Yes | Yes |
| Separate pre-filter | - | Yes |
| Adjustable flow | - | Yes |
| Built-in UV | No | No |
| Built-in heater | No | No |
| Water-change valve | Yes | No |
| Power and build | ||
| Power draw | 43 W | 16 W |
| Warranty | 3 years | 3 years |