Built a similar thing to Garfs BADASS to replace a little waterfall that I've had running for a while. Not convinced it's going to work though. Vid here https://dl.dropboxusercontent.com/u/59581966/20131110_125932.mp4 The screen is ceramic tile (104 sq inches). The water level in the chamber is 2 inches. The bulbs are 2 x 15w 2700k CFL spots and are approx 4 inches from the water surface (so 6 inches from the screen). Flow is about 800 (175 gals) litres per hour direct from the overflow. The green on the screen has not grown on it's own, I rubbed it in with an old live waterfall screen. Tank size is about 55 gal, feeding 1.5-ish cubes a day This is day 1 Suspect it will need more light. Thoughts?