OK. This article was in this morning's paper.

http://www.southbendtribune.com/article/20091115/News01/911150315/1052/News01

My wife saw it and asked if I had heard of blue-green algae. She is concerned now because we let our kids swim in the pond as well as the dogs. I have told her that the greenish tint is a sign of a healthy pond. The article, however, is concerning to her. I know the good greenish tint is a healthy plankton bloom, but she wanted me to do some further research.

So, I came to the experts. I did a search but didn't really find anything on blue-green algae. How concerned should we be? How could we identify blue-green algae?

Any information would be appreciated.