Included with all Blade fixtures 39" or smaller, the flush tank mounts rest right on the side walls of your aquarium. This low-profile solution is great for fish-only and freshwater aquariums where illumination is the primary goal. The wide-angle output of the Blade achieves sufficient illumination even when mounted close to the water's surface and the IP66-rated water resistance means you won't have to worry about moisture damage to the light fixture.