I have been doing research and that's what I was thinking it was, just wanted to confirm. The other thing I've been trying to learn and haven't really found anything. I'm thinking all this is result of nutrient overload from the flooding. What's the odds of this stuff going away and not returning? I've never had a problem with any of this until after the large amount of rain and I'm downstream from a cow pond. I haven't done any treatments but have been monitoring it closely. It does not appear to be spreading. My hopes and might be a long shot is that as the nutrient level depletes from overflow, that the pond will return back to normal. Is that just wishful thinking with this stuff or is it possible?