Fluval
Fluval FX6 Canister Filter
$369.99
Best Aquarium Filters · head-to-head
Fluval FX6 Canister Filter vs OASE BioMaster Thermo 850 Canister Filter
A sourced, side-by-side comparison. Fluval FX6 Canister Filter is cheaper at $369.99. Every spec and price links to its source.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Fluval FX6 Canister Filter |  OASE BioMaster Thermo 850 Canister Filter |
|---|---|---|
| US price | $369.99 | — |
| Brand | Fluval | OASE |
| Released | — | — |
| Type | canister | canister |
| Flow rate gph | 925 | 400 |
| Tank size gal | 400 | 250 |
| Media capacity (L) | 5.9 | 8 |
| Media stages | 3 | 4 |
| Wattage | 43 | 32 |
| Self priming | Yes | Yes |
| Dimensions (in) | 15.75 x 15.75 x 20.8 | 9.4 x 9.4 x 21.1 |
Sources — Fluval FX6 Canister Filter: fluvalaquatics.com (verified 2026-08-01). OASE BioMaster Thermo 850 Canister Filter: aquaristikshop.com (verified 2026-08-01).
What's the difference between the Fluval FX6 Canister Filter and OASE BioMaster Thermo 850 Canister Filter?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- Flow rate gph: Fluval FX6 Canister Filter 925 vs OASE BioMaster Thermo 850 Canister Filter 400
- Tank size gal: Fluval FX6 Canister Filter 400 vs OASE BioMaster Thermo 850 Canister Filter 250
- Media capacity (L): Fluval FX6 Canister Filter 5.9 vs OASE BioMaster Thermo 850 Canister Filter 8
- Media stages: Fluval FX6 Canister Filter 3 vs OASE BioMaster Thermo 850 Canister Filter 4
- Wattage: Fluval FX6 Canister Filter 43 vs OASE BioMaster Thermo 850 Canister Filter 32
- Dimensions (in): Fluval FX6 Canister Filter 15.75 x 15.75 x 20.8 vs OASE BioMaster Thermo 850 Canister Filter 9.4 x 9.4 x 21.1