Fluval 407 vs Oase BioMaster Thermo 350
Two of the best canister filters you can buy, aimed at the same 200–350 L tanks. The Fluval 407 is the quiet, high-flow value pick; the Oase BioMaster Thermo 350 builds in a heater and a clever pre-filter. Here's which one suits your tank.
The quick verdict
Both are excellent, so the choice comes down to two features. If you want fewer things in the tank and longer gaps between deep cleans, the Oase BioMaster Thermo 350 — with its integrated heater and pre-filter — is worth the premium. If you want the most flow for the money and near-silent running, the Fluval 407 is the value champion.
| Fluval 407 | Oase BioMaster Thermo 350 | |
|---|---|---|
| Max flow | 1450 L/h | 1050 L/h |
| Built-in heater | No (add separately) | Yes, integrated |
| Pre-filter | No | Yes (longer maintenance) |
| Noise | Very quiet | Quiet |
| Media capacity | Large, 4 baskets | Large |
| Value | Often cheaper | Premium |
| Best for | Flow, quietness, value | Clutter-free tank, easy upkeep |
Flow, heating & maintenance
The Fluval 407 pushes serious flow (1450 L/h) very quietly, with lift-out baskets and quick-release valves that make cleaning painless — you just add your own heater. The Oase BioMaster Thermo trades a little top-end flow for two genuinely useful ideas: an inline heater so nothing warms the display tank, and a pre-filter sponge you rinse often so the main biological media is disturbed far less. On a planted tank especially, that clutter-free, low-fuss setup is lovely.
Which should you buy?
Our pick
For most planted and community tanks where a tidy scape and easy upkeep matter, we'd take the Oase BioMaster Thermo 350. If budget or raw flow leads, the Fluval 407 is superb and usually cheaper. Read the full Fluval 407 review and Oase BioMaster review, or see all aquarium filters.
Frequently asked questions
Is the Oase BioMaster or Fluval 407 better?
They win on different things. The Oase BioMaster Thermo bundles a heater and a pre-filter module for longer maintenance intervals and a clutter-free tank. The Fluval 407 pushes more raw flow, runs very quietly and is often cheaper. Pick the Oase for the integrated heater and pre-filter convenience; pick the 407 for flow, quietness and value.
Do I still need a separate heater with the Oase BioMaster Thermo?
No — that is the whole point of the "Thermo" version: the heater lives inside the canister, so there is nothing heating in the display tank. With the Fluval 407 you add a separate in-tank (or inline) heater.
Which is easier to maintain?
The Oase edges it thanks to its pre-filter module: you rinse a single coarse sponge often and disturb the main biological media far less. The Fluval 407 has quick-release valves and lift-out media baskets that make full cleans easy too.
Found your model? Buy it at the right price.
UniverTrack tracks the real price of your aquarium gear across several retailers, spots fake discounts and warns you when it's genuinely the right moment to buy — with an AI assistant to guide you.