Beretta, Dave has way more experience than I do, so my experience with this may mean squat. I went through a similar situation about a month or so back. I was fertilizing every 10 days or so in an attempt to get my bloom going after this past winter. At one time I saw some green looking flakes floating around the pond. Looked like green glitter flakes. I also saw some area where a green film was floating on the surface, mostly where the wind had blown it to an area of the pond. I was concerned and posted my experience here on the forum. I received several comments after posting and I came to understand I was having a good bloom and what I was seeing was part of that bloom with excess phytoplankton. I was getting some spring rains at the time and I believe the bloom was diluted back by the rain, so not sure what all took place as I have only about 18 months of pond experience's under my belt, but things seamed to turn out ok. I did not see any floaters during this event.
Tracy
