Simplify aquarium maintenance with the Clear-Free Premium Undergravel Aquarium Filter 15 / 20 H Gallon. This expertly designed filter offers hassle-free biological filtration and comes equipped with activated carbon filters for removing waste and harmful substances from the water. Its adjustable jumbo 1 inch lift tubes allow for customizable height to suit your tank’s water level. Choose the right filter size for your tank’s gallon capacity and enjoy a clean and thriving aquarium, perfect for aquatic turtles and amphibians.