My pond often develops some FA in late January here in N.E.GA. I was looking today in the shallow water along the edge where it begins growing on the organic matter on the bottom and found none. The water has a good bloom but I didn't measure the visibility. The geese must be doing a good job of fertilizing the 3.5 acres. My observations have been that the phytoplankton competes with FA for nutrients.

I have had success controlling FA, when it first appears, with a small amount of hydrated lime scattered with a shovel onto the shallow water where the FA is beginning to grow.