I am lighting a 55 gal with a Corallife 2 tube t5ho 48in fixture (6500k bulbs) for 11 hours a day. To keep the evaporation down am using glass covers. Does anyone know what effect the covers would have on the effectiveness of the lamps?
The effect will be minimal, if at all, if you clean the canopy regularly. If not, the minerals in the water will build up on the glass and make it a bit hazy. I've noticed a build up on my tank canopy if I don't clean it weekly.