Boyu · Internal
SP-C / SP-B Internal Filter
- Flow
- 300–1,400 L/h
Quarantine, hospital or grow-out tanks, and simple community tanks that need an easy internal filter.
4 models
Dophin · Internal
Dophin FB Internal Filter
A plain rectangular internal filter with a sponge body and a side outlet that can take a rain bar. Four sizes cover roughly 50 to 140 litres.
Updated
300–760 L/h4 models
Will it suit my tank?
litres
Best for
A basic community or planted tank where a simple sponge internal filter is enough.
Worth knowing
Media volume is small, so it needs rinsing often in a heavily stocked tank.
What stands out
- Four sizes, 300 to 760 L/h
- Rain bar option for spread flow
- Simple sponge-based media
- Compact footprint
Models and specs
| Model | Flow | Tank size | Power | Dimensions (L × W × H) |
|---|---|---|---|---|
| FB-1000F52 0004 | 300 L/h | up to 50 L | 3.3 W | 5 × 4.2 × 14.8 cm |
| FB-2000F52 0005 | 400 L/h | up to 80 L | 5 W | 6 × 5.2 × 18.5 cm |
| FB-3000F52 0006 | 480 L/h | up to 110 L | 7.2 W | 6.7 × 5.7 × 21.5 cm |
| FB-4000F52 0007 | 760 L/h | up to 140 L | 13.8 W | 7.7 × 6.2 × 28 cm |
- Brand
- Dophin
- Figures quoted
- 230 V / 50 Hz version
Figures from the maker's published specifications. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all filters
Eheim · Internal
aqua Corner Filter
- Tank size
- 100–200 L
Beginner planted tanks of roughly 100 to 200 litres where you want something simple that hides in a corner.
1 model
Eheim · Internal
Aquaball
- Flow
- 480–650 L/h
- Tank size
- 30–180 L
Small to medium low-tech planted tanks, or as a backup filter and circulation boost on a bigger tank.
3 models
Eheim · Internal
Biopower
- Flow
- 550–750 L/h
- Tank size
- 80–240 L
Medium planted tanks without room for a canister, or tanks with a heavier fish load that need more biology than a basic internal.
3 models
Frequently asked questions
Quick answers about the Dophin FB Internal Filter, drawn from its specs.
What size tank is the Dophin FB Internal Filter good for?
Using the 5 to 12 times turnover rule for planted tanks: FB-1000F (300 L/h, suits roughly 25–60 L); FB-2000F (400 L/h, suits roughly 33–80 L); FB-3000F (480 L/h, suits roughly 40–96 L); FB-4000F (760 L/h, suits roughly 63–152 L). The maker rates the range for tanks up to 140 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 Dophin FB Internal Filter best for?
A basic community or planted tank where a simple sponge internal filter is enough.
Is there anything to watch out for with the Dophin FB Internal Filter?
Media volume is small, so it needs rinsing often in a heavily stocked tank.
What are the alternatives to the Dophin FB Internal Filter?
Other filters worth comparing: Boyu SP-C / SP-B Internal Filter, Eheim aqua Corner Filter, Eheim Aquaball. Add any of them to the compare table to see the specs side by side.