Protect your aquarium against evaporation and jumping fish with these clear glass lids. Each glass cover includes a set of four plastic mounting clips and provides a perfect fitment for each respective tank. Please keep in mind that these glass lids cover the majority of the open top of the tank leaving a 3/16" space on each side. If the glass lid panel is mounted towards the front of the tank, this leaves a gap between the rear of the glass panel and the back of the aquarium that is large enough to accommodate an Aquatop Forza Hang on Power Filter. Alternatively, we recommend using an internal filter if incorporating a glass lid to your set-up.