I am new here so please bear with me. I have a form of algae in my pond that I don't know what to do with, it forms around the side and clings (mats) to the stones then breaks off and floats to the top, the color is a brown green. I have a windmill to supply air and add aquashade,I have used cutrine plus but with little or no effect. I have been skiming the floating mats out of the pond but it is an endless battle, I have never had this problem before and I am at my wits end.I have raked the stones along the side about three times but it keeps coming back and when I rake the stones they are black on the bottom side. I need some help in solving this problem.

Thanks Bob