Niko I had an idea while rearranging my tank today. The front of the overflow box is ugly
and in another thread there is talk of attaching rock to acrylic. I dont think you would want to hook it direct to the overflow box becuse you have to take the box out to clean it from time to time. SO my idea is this -- make a sheet of acrylic that hangs down across the front of the box -- might need to start just below the comb -- not sure. But then you could slip it off and sit it down in the tank out of the way when you need to clean -- then hang it back after you are done.
Seems like it would be fairly simple to make -- flat sheet of correct size acrylic with one or two 'hangers' at the top to attach to the overflow.
If that works something simalar could be done to help hide the big ugly powerheads. They might be a little harder as you would not want to restrict water flow.