I bought this for a 20 gal high when I went with live plants (No CO2) and started having algae problems right away. Now I am setting up a 29 gal and wonder if some of the algae problems might be the light. It says it is 26W, 20V, 64 (6500K White), 12 (450nm Blue) and 8 (660nm Red). I have no idea what that means. I have just been using it at the settings it came with. It is sitting above the glass with the brackets on the edge of the tank. Is that ok or too much light?