During the last week my pond has developed a green scum that appears to look like foam. It floats around with the wind currents when I don't have my aerator turned on. When the wind blows it to one end it is quite heavy and totally covers the water. With the green color I assume it is some type of algae, but don't remember seeing this before. I've had lots of algae problems the last couple years, but this one is different. If this is some kind of algae bloom should I disregard and let it go away by itself?? Doesn't appear to be getting any worse, but covers a good part of my pond, especially when spread out. It would be hard to spray because it's all over the place.