- 🐠 FOR 5–10 GALLON AQUARIUMS: The compact sponge filter measures approximately 2 inches in diameter and 4.8 inches high, making it suitable for nano and small fish tanks.
- 🧽 MECHANICAL & BIOLOGICAL FILTRATION: Fine foam traps suspended debris while providing surface area where beneficial bacteria can colonize and support the aquarium’s biological cycle.
- 🦐 GENTLE FOR SMALL AQUATIC LIFE: The sponge intake reduces the risk of tiny shrimp, fry, bettas and other small fish being drawn into a conventional filter inlet.
- 💨 AIR-POWERED OPERATION: Rising bubbles move water through the sponge while supporting water circulation and gas exchange. A compatible air pump and airline tubing are required and are not included.
- 🚿 SIMPLE AQUARIUM-WATER CLEANING: Detach the sponge and gently rinse or squeeze it in removed aquarium water every two to four weeks. Do not clean it with untreated tap water.
Pawfly Nano Bio Sponge Filter for Small Aquariums
The Pawfly Nano Bio Sponge Filter is a compact, air-powered filtration option for aquariums holding approximately 5–10 gallons. Its fine foam construction supports both mechanical filtration and biological filtration without creating the strong intake associated with many powered filters.
The gentle design is particularly suitable for bettas, ornamental shrimp, newly hatched fry and other small aquatic animals.
Mechanical Filtration with Fine Foam
As water is drawn through the sponge, the foam captures floating particles, leftover food and other visible debris. Regular maintenance helps preserve water flow and prevents the sponge from becoming excessively clogged.
Filtration results depend on the aquarium’s stocking level, feeding routine, air-pump output and maintenance schedule. The filter cannot guarantee clear or safe water without proper aquarium care.
Gentle Intake for Fry and Shrimp
The broad foam surface distributes suction across the sponge instead of concentrating it at a narrow intake opening. This makes the filter useful in breeding, shrimp and betta aquariums where small animals may be vulnerable to conventional filter inlets.
Observe livestock after installation and adjust airflow if the water movement appears too strong.
Biological Filtration Support
The porous sponge provides surface area where beneficial microorganisms can establish. These bacteria contribute to processing waste compounds as part of the aquarium nitrogen cycle.
A new sponge filter is not biologically mature immediately after installation. Continue monitoring ammonia and nitrite while the aquarium cycles, and do not rely on the filter alone to make unsafe water suitable for fish.
Protecting Beneficial Bacteria
Clean the sponge with aquarium water removed during a routine water change. Untreated tap water may contain chlorine or chloramine that can damage the beneficial bacterial population.
Avoid replacing or deep-cleaning all biological media at the same time.
Air-Powered Filtration and Aeration
This sponge filter operates with air supplied by an external aquarium air pump. Bubbles rise through the central lift tube, drawing aquarium water across the sponge and returning it to the tank.
The movement of bubbles can support surface agitation and gas exchange. Actual sound levels depend mainly on the selected air pump, airflow setting, vibration isolation and bubble size.
Required Equipment
The source listing includes the sponge-filter unit but does not include an air pump. To operate the filter, users generally need:
- A compatible aquarium air pump
- Suitable airline tubing
- A check valve when required by the installation
- An optional airflow-control valve if adjustment is needed
Confirm the included components before purchase. Accessories sold separately should be selected according to the air pump and aquarium setup.
Check-Valve Placement
If the air pump sits below the aquarium’s water level, install a suitable check valve in the airline according to its instructions. This helps reduce the risk of water flowing backward toward the pump during a power interruption.
Compact Size for Nano Tanks
The filter measures approximately 2 inches in diameter and 4.8 inches high. Its vertical shape uses limited floor space while still providing a relatively broad sponge surface.
Before ordering, confirm that the aquarium has enough clearance above the substrate and below the waterline for the complete filter and lift tube.
How to Install the Sponge Filter
- Rinse the new filter in clean, dechlorinated water or removed aquarium water.
- Connect compatible airline tubing to the filter’s air inlet.
- Install a check valve and airflow control if required.
- Connect the airline to a suitable external air pump.
- Submerge and gently squeeze the sponge to release trapped air.
- Position the weighted base securely on the aquarium floor.
- Switch on the air pump and adjust the airflow.
- Confirm that bubbles rise through the lift tube and water moves through the sponge.
Placement Tips
Place the filter where water can circulate around the sponge. Avoid pressing it tightly against aquarium glass, decorations or dense plants that may restrict flow.
Keep the air pump on a stable surface and isolate vibration when necessary to reduce transmitted noise.
Product Specifications
- Brand: Pawfly
- Product type: Air-powered aquarium sponge filter
- Selected pattern: Up to 10 gallons
- Recommended aquarium size: Approximately 5–10 gallons
- Filter dimensions: Approximately 2 in diameter × 4.8 in high
- Filter weight in comparison table: Approximately 2.8 oz
- Filtration types: Mechanical and biological
- Primary material: Fine aquarium-filter foam
- Power source: External air pump
- Air pump included: No
- Recommended livestock: Betta, shrimp, fry and small ornamental fish
- Package dimensions: Approximately 3.11 × 2.44 × 2.32 in
- Listed package weight: Approximately 3.17 oz
- Model number: Pawfly-CW0607-BK
- Manufacturer: Pawfly
- ASIN: B09BNCRLZY
Cleaning and Maintenance
Recommended Cleaning Routine
The manufacturer recommends rinsing the sponge approximately every two to four weeks. The actual interval may vary with stocking density, feeding and debris levels.
- Turn off and unplug the air pump.
- Remove some aquarium water into a clean container.
- Detach the sponge from the filter assembly.
- Gently squeeze and rinse it in the removed aquarium water.
- Reassemble the unit and return it to the aquarium.
- Restart the air pump and verify normal bubble flow.
What to Avoid
- Do not rinse the established sponge under untreated tap water.
- Do not use soap, bleach or household cleaning products.
- Do not allow the sponge to dry during routine maintenance.
- Do not replace mature media unnecessarily.
- Do not operate the air pump where it can fall into water.
Aquarium Safety Information
- Use equipment suitable for the aquarium’s actual volume and stocking level.
- Create a drip loop in electrical cords.
- Keep the air pump and electrical connections dry.
- Install a check valve when back-siphoning is possible.
- Test ammonia, nitrite, nitrate, pH and temperature regularly.
- Adjust airflow if fish or shrimp appear stressed.
- Inspect the sponge, lift tube and airline for blockage.
- Use additional filtration when the biological load exceeds the unit’s capacity.
- Disconnect electrical equipment before placing hands in the aquarium.
This nano sponge filter can support routine aquarium filtration, but water quality still depends on responsible stocking, feeding, cycling, testing and maintenance.
