No the water didn't go over the overflow. The pond is pretty low right now.
It was pretty bright green initially. The watermeal was starting to get a brownish tinge to it 2 weeks ago, but still mostly green, but definitely not bright. Last week was about the same color, just less of it. This week it's gone. By the way I still see green watermeal residue on the shoreline where the water has receded since the application of the Sonar.