Fluval 207 vs 307 Canister Filter
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Quick answerSame design, different size. The 207 is rated for 20 to 45 gallons with 121 GPH of real circulation; the 307 for 40 to 70 gallons with 206 GPH, per Fluval. If your tank is 40 to 45 gallons, or heavily stocked, the 307 gives more turnover and more media room. Below 40 gallons, the 207 is the fit.
Specs below are from Fluval's 07 Series page. We haven't tested them.
Side by side
| Fluval 207 | Fluval 307 | |
|---|---|---|
| Rated tank size | 20-45 US gal | 40-70 US gal |
| Pump output | 206 US GPH | 303 US GPH |
| Circulation with media | 121 US GPH | 206 US GPH |
| Power | 10W | 16W |
| Canister volume | 5.3 L | 7.3 L |
| Max head height | 4.75 ft | 5.75 ft |
Turnover math
Habitattitude says a pump should circulate the tank's volume "several times each hour." Using Fluval's circulation figures (our arithmetic):
- 207 on a 30 gallon tank: about 4 times an hour.
- 207 on a 45 gallon tank: about 2.7 times.
- 307 on a 45 gallon tank: about 4.6 times.
- 307 on a 70 gallon tank: about 2.9 times.
The picks
20-45 gal
Fluval 207 Canister Filter
- For aquariums up to 45 gallons (title)
- Listed as up to 25% quieter than before
- EZ-Lift media baskets
40-70 gal
Fluval 307 Canister Filter
- For aquariums up to 70 gallons (title)
- Listed as up to 25% quieter than before
- EZ-Lift media baskets
More sizes in canister filters.
FAQ
Main difference?
Rated size and flow: 20-45 vs 40-70 gallons.
For a 40 gallon?
Either; the 307 gives more turnover.
Power?
10W vs 16W.