The water seems to be getting greener. And, in the slow 'evolution' of the pond ecology, pond scum is returning. To me, it does not appear the same - close-up - as any previous incarnations.
The pic of the scum is deceptive. The greenness of the water obscures the greenness of the scum. And is it scum? A collated patch of bubbles? I wonder if it will cover the whole pond surface?
