got this idea. Did anyone have the experience that the return flow line is covered with algae (in my case hair algae?)? Could we make something like a tray (like those used in wet/dry filters) and pour water in and it then drops into the tank? After a period of time that tray will be covered with algae and all we do is clean it up. a simple scrubber/algae method of harvesting. No additional light needed! but would it work? comments?