But seriously, is this just a mild algae problem or is the tank totally covered? Turbo snails are pigs and will really work over those rocks. If you can find Mexican Turbos, they eat bubble algae too - well, atleast in my tank! It would be best to get a variety of snails but a pic of your tank would be great!
Depending on the algea, I use a toothbrush or a turkey baster, combined with a temporary fine mesh filter in my sump to catch to residue. Frequent cleaning with a turkey baster works wonders on your reef.