Aqueon Deluxe Full Hoods are custom fit to sit on the inside lip of the aquarium frame, which greatly reduces evaporation. A full length door provides roomy access in the front, and cut out sections in the rear allow installation of heaters, power filters and other popular accessories. Includes a full-spectrum fluorescent lamp. Perfectly compliments All-Glass/Aqueon 20L, 29, 37 aquariums and designed to fit all major brands of aquariums (please check measurements). Frame, top openings: 29-1/4" x 11-1/2".