Included with all Blade fixtures 39" or smaller, the flush tank mounts rest right on the side walls of your aquarium, the tank rest extends up to 4.5 inches on either side of the blade (for a total of 9 inches).
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.