The most popular hood. Designed to perfectly fit 20 long, 29, and 37-gallon All-Glass aquariums.Provides excellent lighting and greatly reduces water evaporation. Keeps fish from jumping out.Custom fit to sit on the inside lip of the aquarium frame, preventing water seepage. A full length door provides roomy access in the front while cut out sections in the rear allow installation of heaters, power filters, and other popular accessories.Fluorescent fixture includes the tube and internally mounted ballasts with instant start circuit.Provides excellent lighting and greatly reduces water evaporation. Keeps fish from jumping out.