PETCO Double Sided Aquarium BackgroundOur PETCO Aquarium Background reverses for two backgrounds in one! Aquarium backgrounds help to eliminate water stains from appearing on the back glass of your aquarium as well as hide your tubing and power cords. Our backgrounds are printed on waterproof plastic for long life. Additionally, our background may be trimmed to fit smaller sized aquariums or terrariums.For fresh and saltwater aquariums..