Sponge Filters and Air Pumps for Planted Tanks
A sponge filter is a block of foam that rising air from a pump draws water through, so it filters gently and its intake is much less likely to trap shrimp or fry. It works as a set: the sponge, an air pump strong enough to drive it, and airline with a check valve.
What matters most
Size the sponge to the tank
Makers rate sponge filters by tank volume. Pick one rated for your tank, or run two smaller sponges in a longer tank so flow reaches both ends.
Match the pump to the filter
Small pumps are rated for small tanks. If you plan to run two sponges or a larger filter, choose a pump with enough airflow or two outlets, and add a valve so you can turn it down.
Fit a check valve
If the pump sits below the water line, a check valve stops water siphoning back into it during a power cut. Some pumps include one; many do not.
Think about noise and placement
The pump, not the sponge, makes most of the noise. Set it on a soft surface and keep it above the water line where the maker says to.
Check before you buy
- What is the tank volume, and is the sponge rated for it?
- How many sponges will one pump run?
- Will the pump sit above or below the water line?
- Do you already have airline tubing and a check valve?
- Do you keep shrimp, fry or a betta that need gentle flow?
Your tank already has a filter with a guarded intake and the flow suits your fish and shrimp.
Ready to choose?
We have checked 8 sponge filters and air pumps options for identity, specifications, and fit. Compare them, with what each needs and who should skip it, here: