Here's the answer to my own question! I've called the state and talked to an expert on cyanobacteria. What is present in our cove and actually throughout the lake is GLOEOTRICHIA. He said there is not as much known about it as other cyanobacterias, but it is thought to have a "little" toxicity to it. He said it should be gone by the end of the month and that he would avoid swimming if it appears in great mass. Mystery solved!
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