Thanks for all of ya'lls responses. At least I have some kind of a plan in my head on what i need to do. I will get the water and soil tests and try some moderate spraying of the duck weed and mosquito fern. I'm guessing that 25 square feet out of 5 acres affected is not too much? Again I do not want to depleet the oxygen in already shallow water. I will possibly get some tilapia. Any help on where I can get the tilapia somewhat close?