I was going back and forth with where to mount my GHL 2 doser. I didn't really have a good spot for it so I decided to make a floating shelf. I made it out of aluminum L channel that. I picked up at Home Depot. Spray painted it black to match everything and mounted it to the plywood under the tank. It turned out to be a great use of space and I may make a few more similar ones to house all of the power supplies from the DC pumps.