As I move through my pond's first year, I found hair algae to be a big problem once the weather turned SoCal cold. Seemed to grow faster than I could remove it. Now that it is warming up, it is dissappearing quickly. Why? I would expect the opposite. I don't think it is related to filtering, which is way more than I need. The plants that I want to grow are doing their usual thing. The three small American Flagfish and six recently introduced fingerling Garra Pingi Pingi couldn't possibly be making so large a dent. Right?