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Patented Aqueon dual-sided dense-floss cartridges contain over 25% more activated carbon than the leading brands. These unique cartridges were designed to ensure even distribution of carbon throughout for more thorough filtration and longer cartridge life. High quality activated carbon keeps water clean Align cartridge bottom key slot for an accurate fit inside the filter Rinse under water to remove carbon dust before replacing For optimal performance, change approximately every 4 to 6 weeks Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria

You don't enjoy being in water that's too cold or too hot for comfort, and neither do your fish. If the water in your tank is too cold, it leads to a slowed-down metabolism for your fish. This results in them becoming sluggish and sleepy. If the water in your tank is too warm, it leads to a fast metabolism. This results in fish being a little too lively and hyperactive. Tetra HT10 50 Watt Submersible Aquarium Heater has an electronic thermostat that automatically adapts to keep the water at a perfect temperature. It features an indicator light to let you know when it's running and heating the aquarium. The heater will also shut off automatically if there's an electrical short, ensuring everyone's safety. This heater is ideal for 2-10 gallon aquariums. Features: Electronic thermostat Automatically adapts Keeps water at a constant temperature Indicator light Automatically shuts off if there's an electrical short Ideal for 2-10 gallon aquariums