Pawfly Aquarium Corner Sponge Filter Quiet Betta Fry Shrimp and Small Fish Bio Foam Filter with Natural Stones Gravels and Ceramic Rings for Fish Tanks up to 30 Gallons (Air Pump Not Included)

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 bottom gravels absorb excess damaging substances and release trace elements. And the ceramic rings can cultivate beneficial substances. Always keep water fresh.
For 30 Gal Tanks: Measure 3.1″ R x 3.3″ H. Fit for 10-30 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 outlet tubing is freely adjustable in height and the duck-billed 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!