Lou, thanks for the reply. I was hoping that Bob would reply because I think he authored the article. I did finally find a new spot for the horses so in the future I won't have as much of a nitrogen influx into the pond. That should help with the algea. The Milfoil has suddenly sprung up out of nowhere and taken over my pond. There is an open hole in the center of the pond where it is 12' deep and the rest is covered with Milfoil. I did just have a fish kill that got almost all of my channel cats (up to almost 20 lbs.). I am putting in an aerator to hopefully prevent that from happening again.