Yesterday I noticed my pond water has turned a nice greenish color. It looks like the pea soup I read about. Not sure what happened. I can still see fish swimming about a foot or more down. The weather has been nice here. In the 80's during the day and a few mid 70's days here and there. A few showers as well. I'm thinking of spraying the algae to kill it for now and see what happens. Can anything else cause a plankton bloom? I remember the pond turning the same color last year but not sure what month or the weather conditions. Was busy moving, building and a baby. Could runoff from my fertilzed lawn cause this?