Pawfly Aquarium Corner Sponge Filter Quiet Small Fish Bio Foam

Multi-layer Fine Sponge: Provide mechanical and biological filtration and trap debris or wastes without sucking up your fish. Keep fish tanks crystal clear and healthy. Further Cleaning: The gravels inside absorb excess damaging substances and release trace elements. And the ceramic rings can cultivate beneficial substances. Always keep water fresh. For 50 Gal Tanks: Measure 3.1" R x 6" H. Fit for 20-50 gallon fish tanks. You can change the sponge sequence at will and customize the filter materials according to the breeding density of the fish. Quiet Aeration: Air powered and cause no disturbance to your daily life. The wide duck-billed air outlet port brings more bubbles to promote oxygen circulation. Easy to Clean: The filter can be easily detached for cleaning. Rinse the sponges every 2 to 4 weeks with aquarium water ONLY. Avoid soaking or washing them in tap water! Replace the white sponge every 2-3 months!