Pond Boss Forums INTRO Questions & Observations Could use some advice on a small algae bloom

My pond does not get much of a breeze across it on a regular basis, but I do have 3 diffusers in the 1/4 acre pond. Over the past 2 years I have had similar occurrences. It starts as an oily looking film, no appreciable rainbow effect, but a thin film just the same. This film may be pollens that will feed some sort of small organism or the organisms themselves (algae, diatoms, protozoans, and/or bacterial scums). If I do not get a few hours of wind action or a nice rain, it progresses to a darker green/brown surface film which can eventually turn into a nasty scum.

Here's a threads of mine that show what my pond can do. Hopefully yours does not get this bad...

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=40299&Number=523419#Post523419

Here are what happens without the wind action or rain. In order of progression...









The key factors, I believe, for the obnoxious outbreaks at my pond are the lack of wind and rain along with its small size. Here is a good filed guide for this sort of stuff...

https://www.townofchapelhill.org/home/showdocument?id=28866