I have a 1\2 acre pond that is around 3 years old stocked with fish. Until this year my algea problems were slight but things have changed. I am not sure what has happened but I did lime the pond and add a small amount of liquid fertilizer early in the spring. I keep a powerhouse aerator fountain running around 16 hours a day and it is keeping the duckweed on one end but I sure would like to get rid of it for I fear it will deplete the oxegen level. I have treatred the water with aqua blue and recently added a 8-8-5 fertilizer "I think the numbers are correct or close to correct for the fertilizer". I can pump water from a creek to one end and let the duckweed flow out over the dam if I need to but I will have to install 250' of pipe and will this solve my problem or can I treat the water without harming fish and or the creek. Not sure what is the best but I want to protect the environment and my fish.