I seem to have a dilemma. I am having an algae problem along with some weeds in my 3 acre pond. When reading the label on the Cutrine Plus, I see that I can't use it since I have nearly a dozen very large koy in my Bass and BG pond. I also have a containerized lilly pad that some other herbicides/aquacides will eliminate. The weeds and algae are covering about 40% of my pond. I used Aquashade this year, but I believe I was a bit too late in applying it. I also had some fish die when I put it in. Any suggestions would be helpful. I know that I can rake it out...but it's a very large area.

Thanks in advance.