Keep a lid on your aquarium, and protect your fish from other pets and unwanted debris. This Glass Canopy by Seapora helps minimize water evaporation while preventing daring escapes! It also puts a protective layer between your light fixture and aquarium water. It is sized for a perfect fit, and is easy to install and clean! It fits the following aquariums: 15R, 20H, 25R, and 30XH.