Our pond has been up and running approx 8 weeks (There are 8 frogs!) but now I have that long green algae on my waterfall rocks. The pond water is a darkish brown, not clear at all. There are some leaves on the bottom but I hesitate to clear them out because of the frogs. I have a skimmer filter and a waterfall filter that holds some "plastic feeling" green stuff to catch the algae. I've been reading about barley straw. Does this work? Also, should I worry about this now as the weather will be getting cold and I'm thinking the algae will die. I'd rather not use chemicals but it might be my only option.