RMS Radion Mounting System Modular hanging and mounting solutions for one or multiple radion LED lights The multi-light RMS offers a customizeable multi light mount solution for Radion XR30 and Radion XR15 lights. The multi-light RMS system features Built-in cable management Compatible with rimmed, rimless, and eurobraced tanks Extremely rigid and light Anodized Aluminum Finish Flexible slide mounts allow for you to move and rotate your Radion position to perfectly illuminate your corals Mounts Radions optimally at approximately 7 inches 18cm above glass Tanks come in a lot of shapes and sizes. To accommodate the vast majority of commercially available and custom aquariums the RMS multi-light rails start at 20.5 inches and increase in 10 inch increments to 90.5 inch. The multi-light RMS allows for adjustment of the rail with respect to the arms meaning that even if your tank is not a common length there is a rail length that will work for you *** Track Length Guide *** Because the multi-light RMS is a modular system, choose the components that fit your needs. To build a mount you will need a set of arms, the right rail for your tank and the number and model of light mounts that fit your setup. Its as simple as A,B and C.