I fertilized my pond for the first time last Thursday with granule type fertilizer. I went to the pond today and have a green film on a third of the pond, and im sure if the wind changes direction it will follow. Do I need to worry about this film on the pond and will it possibly go away by itself? I'm sure its from the fertilizer due to this being the first time the film has shown up and it was just built in May. I plan on stocking in October and don't want to cause harm to the fish. Oh yeah, some of the green film has bubbles in it. Thanks for the help in advance.