Hi, OCDP.
I use Prime as well, and have been for a while, I don't think its the cause either. Based on what everyone here has told me I have come to this conclusion:
In nature algae blooms occure often after storms which stir the waters, thus coating the rocks above with nutrient rich ditritus. After the storm when the sun comes out algea diatoms germinate and begine to thrive on the detritus. I suppose time is the only cure for this naturally occuring incedence. With the help from my reef crew I might be able to achieve a natural balance once agian.
Does this sound about right?