Upettools Aquarium Biological Sponge Filter. Description: 1.This Series Of Products Is A Hanging Filter, Which Is Adsorbed On The Fish Tank Wall And Uses Environmentally-Friendly High-Grade Sponge As The Filter Material. 2.It Is Used Together With The Air Pump To Achieve The Dual Functions Of Growth And Filtration. 3.This Series Of Products Can Effectively Solve The Problem That Your Fish Tanks Change Frequently. Special Feature 1. Aquarium Bio Sponge Filter Is A Multi- Function Biological Filtration System. 2. Aquarium Bio Sponge Filter Is Patented Design And Appearance. 3. Aquarium Bio Sponge Filter Is Using Environmental Friendly And Biodegradable Filtration Sponge 4. Aquarium Bio Sponge Filter Can Be Used With Different Filtration Material To Enhance Water Quality. 5. Ceramic Pearls Filtration Media Will Help To Remove Harmful Substance Which Will Increase Oxygen Level In The Tank. 6. Aquarium Bio Sponge Filter Is Suitable For Discus, Crystal Shrimp, Planted Tank And All Small Size Tropical Fishes. 7. Color: BLACK Instructions: 1.Product Must Be Used With An Air Pump. Air Pump To Be Place On The Top Of Aquarium Tank To Prevent Reflux Of Water Back Into The Air Pump, Due To Power Failure. 2.Soak The Filter With Aquarium Water 5 Minutes Before Using Which Will Enhance Bacterial Colonies Foaming. 3.Use Aquarium Tank Water While Washing Sponge, Must Not Use Hot Water. Package included: 1* Aquarium Biological Sponge Filter. 4* Replaceable Sponges 4* Replaceable Bio Balls 2* Suction Cups ?