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Weird surface film algae?

Ok, I haven't seen this one listed anywhere.

I first thought it was just pollen from outside (warm day and I had all my
windows open) but the powdery looking stuff floating on the water has grown
until it has formed a heavy film.
Has the consistancy of dust but definately green and multiplies like algae
Only floats... the rest of the water is clear.
It can get thick enought to stop my water lettuces that usually move around
with the current.

Any ideas what this stuff is?