what about light? I have a piece of plexiglass over my tank, with holes so that it doesn't fog, but it always does, or it gets water drops all over. Am I cutting the light from reaching the corals? The tank is pretty bright as it is, but i was always wondering? Also anybody knows where I an find clear netting to make a screen? The one they sell at home depot are dark and I feel like they would block the light. Didn't mean to hijack your tread, Home depot sells plexiglass like i said I use it, and leave it on, all the times, it does cut down on evaporation, also depending on how long your tank is, plexiglass will bend toward the middle.