The Hanging Kit allows the AP9X to be hung from your ceiling or even within your canopy. The Hanging Kit comes with two 118" long hanging cables, two toggle bolts, and two tapping screws, allowing the users to hang the AP9X at adjustable height. Our recommendation is to hang the AP9X 15" - 18" above water surface to obtain a 48"x24" coverage for mixed reef tank, and 5" - 7" above water surface for a 36"x24" coverage for SPS dominant tank.