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Re: Weird surface film algae?

Peter wrote:
>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.

This sounds exactly like an alga I used to culture called Ophiocytium (name 
may be out of date), a yellow-green alga. I had it in one of my aquaria for 
a year or so.