what are your water peramiters? are your phosphates high? is so try some phosguard, it should halp it start to clear in about 5-7 days. My phosphates got a little high for some reason (still unknown) and this seemed to help, also scrape the tank daily if you can. you may be able to scrub some of the algea off the live rock with a really soft toothbrush, it didn't seem to hurt mine.