I am trying to figure out how to convert a used GFO/media reactor into a gravity fed algea scrubber. I have a over the lip overflow box on the back of my 125g tank and would like to get some ideas(or even better) pictures of how to convert a round, used media reactor into a gravity flow algea scrubber. I am stumped as to how I would easily have flow coming in from the top and then out while keeping the water flowing. I am also stumped as to how to connect it up and be able to easily harvest the algea when I get too much without completely tearing everything apart. Can I get some advice on how to accomplish this??