Boyu · Hang-on-back
WF Waterfall Hang-on Filter
- Flow
- 150–720 L/h
Small to medium low-tech tanks and shrimp or betta setups on a budget.
5 models
Oase · Hang-on-back
Oase BioStyle
A hang-on-back filter from Oase that hooks over the rim, so there are no hoses and nothing takes up space inside the tank. It uses a drop-in cartridge with foam, fleece and carbon, and a telescopic clear intake adjusts to your tank depth. Flow is generous for the size, which suits small tanks with light fish loads.
Updated
350–900 L/h3 models
Will it suit my tank?
litres
Best for
Small planted tanks or shrimp tanks where you want easy filtration without a canister or an internal box.
Worth knowing
Hang-on filters splash at the surface, which drives off some CO2 in an injected tank.
What stands out
- Three sizes for tanks up to 70, 115 or 180 litres
- 350 to 900 L/h from 3.5 to 4.5 W
- Cartridge change indicator and simple swap-out media
- Adjustable spacers for a secure fit on the rim
Models and specs
| Model | Flow | Tank size | Power | Media volume | Dimensions (L × W × H) |
|---|---|---|---|---|---|
| 7589600 | 350 L/h | up to 70 L | 3.5 W | 1.1 L | 15.4 × 15.6 × 21.2 cm |
| 11589601 | 550 L/h | up to 115 L | 4 W | 1.9 L | 15.4 × 23 × 21.2 cm |
| 18089602 | 900 L/h | up to 180 L | 4.5 W | 2.7 L | 15.4 × 30.4 × 21.2 cm |
- Brand
- Oase
- Media
- Foam, fleece and carbon cartridge
- Intake
- Clear telescopic intake pipe
- Mounting
- Hangs on the tank rim, adjustable spacers
Figures from Charterhouse Aquatics's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all filters
Dophin · Hang-on-back
A Series Hanging Filter
- Flow
- 300–500 L/h
- Tank size
- up to 100 L
A 40 to 100 litre tank where you want a simple hang-on filter you can fill with your own media.
4 models
Dophin · Hang-on-back
H Series Hanging Filter
- Flow
- 190–1,000 L/h
- Tank size
- up to 200 L
A beginner tank from 25 to 200 litres where a familiar, easy hang-on filter is enough.
6 models
Dophin · Hang-on-back
SH Slim Hanging Filter
- Flow
- 150–380 L/h
- Tank size
- up to 80 L
A 20 to 80 litre tank with a lid-free top where you want surface film gone without a separate skimmer.
4 models
Frequently asked questions
Quick answers about the Oase BioStyle, drawn from its specs.
What size tank is the Oase BioStyle good for?
Using the 5 to 12 times turnover rule for planted tanks: 75 (350 L/h, suits roughly 29–70 L); 115 (550 L/h, suits roughly 46–110 L); 180 (900 L/h, suits roughly 75–180 L). The maker rates the range for tanks up to 180 L. Real flow with media and hoses is lower than the rated figure, so pick the bigger model if you are between sizes.
Who is the Oase BioStyle best for?
Small planted tanks or shrimp tanks where you want easy filtration without a canister or an internal box.
Is there anything to watch out for with the Oase BioStyle?
Hang-on filters splash at the surface, which drives off some CO2 in an injected tank.
What are the alternatives to the Oase BioStyle?
Other filters worth comparing: Boyu WF Waterfall Hang-on Filter, Dophin A Series Hanging Filter, Dophin H Series Hanging Filter. Add any of them to the compare table to see the specs side by side.