Pawfly Large Aquarium Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tank up to 50 Gallon, 3 PackFine Sponge Filtration: It provides mechanical and biological filtration and traps debris or waste without sucking up your fish, keeping a crystal clear water tank. Large Size: It measures 3" D x 8. 3" H. Fit for tanks up to 50 gallons. Suitable for the breeding and feeding of various ornamental fish, shrimp or fry. Easy to Clean: The filter can be easily detached for cleaning the dirt. Rinse it every 2 4 weeks with aquarium water ONLY. Avoid washing