50cm Black Aquarium Filtration Foam Sponge Pad, Bio Filter For Fish Tank,. Upgrade Your Aquarium's Filtration System with This Biochemical Sponge Filter. Designed to Enhance Water Quality, It Ensures Stable and Healthy Conditions for Your Aquatic Life. By Increasing Oxygen Solubility, It Promotes a Thriving Environment in Your Tank. The Sponge Filter Operates Silently and is Built to Last, Making It a Reliable Choice for Long-term Use. Its Excellent Permeability Allows for Easy Cleaning, Ensuring Maximum Efficiency. Adaptable to All Types of Fish Tanks, the Foam Can Be Trimmed to Fit Any Setup Perfectly. Features: - Biochemical Filtration for Stable Water Quality - Increases Oxygen Solubility - Durable and Noiseless Operation - Excellent Permeability for Easy Cleaning - Customizable Foam Size: 50cm X 50cm X 2cm - Compatible with All Fish Tank Types.