AQUA ILLUMINATION - FLEX MOUNTING ARMS FOR PRIME LED Aqua Illumination Sale! from 2624 /per Title Aqua Illumination 12" Flex Mounting Arm for Prime LED Aqua Illumination 18" Flex Mounting Arm for Prime LED Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. The silicone-coated flex arm is both an attractive and sturdy. AquaIllumination`s most flexible mount for a rimmed or rimless tank. A new, and easy, way to mount your Aqua Illumination Prime LED fixture. Available in 12" and 18" sizes. The flexible gooseneck allows for easy position and adjustment of your light.