The Eheim Autofeeder is great at adding a specific amount of fishfood to your tank once or more per day, but the food often lands on the surface and heads straight to the overflow to go down the drain. Instead of wasting food, I made the Eheim Chimney. The acrylic chimney is reef-safe and penetrates the surface water about 1/2" to make sure the food stays in one spot until it has time to soak, which then allows it to drizzle down into your tank for the fish to consume. Zero waste - every dose of food feeds your fish.
I recommend connecting the Eheim Autofeeder to the acrylic bracket with Velcro(TM) strips, then affix the bracket to your tank's centerbrace or corner trim with more Velcro(TM). The adhesive hook & loop tape will keep the autofeeder dry and prevent it being knocked into the water accidentally. You can watch this brief clip of mine in action. http://youtu.be/ZTxGWdW0gi8 and here's different video with more angles: http://youtu.be/DpPAfwHWKeM?t=106
Customers have also told me that this exact chimney fits the APEX AFS perfectly as well. So it is a dual product.