AQQA Aquarium Sponge Filter Submersible Ultra Quiet Aeration (Small 5-20 Gallon) Review (2026)

Who this filter fits

This small sponge filter is built for 5 to 20 gallon tanks housing shrimp, fry, or bettas, where gentle, low-flow filtration that will not pull in small or young animals matters more than raw turnover, which is exactly the niche air-powered sponge filters are known for. It suits breeders running dedicated fry or shrimp tanks, nano tank keepers who want simple biological filtration without a powered internal or hang-on-back unit, and anyone setting up a low-tech quarantine or grow-out tank. AQQA also sells a medium size rated for larger 20 to 110 gallon tanks, so the size should be matched to the actual tank rather than assumed from the brand alone.

What comes in the box

The package includes the sponge filter body along with two sponges total, one fitted and one spare, plus bio ceramic media balls and an L-shaped connector for attaching air tubing, giving a fairly complete kit apart from the air pump itself. The sponge provides mechanical filtration by trapping debris as water is drawn through it, while the bio ceramic balls inside the housing give beneficial bacteria a larger surface area to colonize for biological filtration, working together rather than the sponge alone doing all the filtering. The unit connects to an air line using standard 4mm tubing through its built-in air stone.

The air pump you still need to buy

AQQA is explicit that an air pump and air hose are not included and are required for the filter to actually run, since the whole unit is powered by air pushed up through the sponge from an external pump rather than an internal motor. Buyers need to size a pump appropriately for the tank, since an undersized pump will move water too slowly through the sponge to filter effectively, while an oversized one can be noisier than necessary for a small tank; a separate airline control valve can help dial in flow once a pump is chosen. This added purchase should be factored into the real cost of getting the filter running.

Maintenance and limits

Both the sponge and the bio ceramic media balls are described as replaceable and washable, with the sponge simple to pull off the frame for rinsing in removed tank water to protect the bacteria living on it, and the ceramic balls reusable rather than needing regular replacement. Because a sponge filter's mechanical filtration is limited compared with a canister or hang-on-back filter, tanks that are fed heavily or stocked densely will need more frequent sponge rinsing to avoid debris building up and reducing flow, and this filter is better suited to lightly stocked nano and breeding setups than a heavily loaded community tank.

Verdict and who should look elsewhere

This is a solid, gentle filter for shrimp, fry, and betta keepers running a 5 to 20 gallon tank who want low-flow biological filtration that will not endanger small or young livestock, and the spare sponge and reusable ceramic media add some value out of the box. It requires a separately purchased air pump to actually function, so factor that into setup cost and noise expectations. Anyone with a heavily stocked or heavily fed tank, or a tank larger than 20 gallons, should look at AQQA's medium sponge filter size or a powered internal filter instead for stronger mechanical filtration.

Frequently asked questions