I would like you guys to think about actually creating a full fledged algal turf scrubber. I believe that it will cure your cyno problem with room to spare. I have used one for years and never had a cyno problem even though I drastically over fed my tank. I even added fish emulsion fertilizer because the tank was running too clean when I over scrubbed.
I stopped using a skimmer as soon as I turned on the lights. Speaking of lights, my second version of a scrubber used a 300 Watt halogen light and it did cause about a gallon of evaporation per day, although it actually lowered the tank temperature.
Then, I built version three and used VHOs. Later, I changed to compact fluorescents. My evaporation dropped dramatically while continuing to lower my tank temperature. You can look at my web site and also check out a thread on another site that t ends up talking about scrubbers.
Reef Central Online Community - New Design for a Non-Photosynthetic System