He means film algae - I'm not sure what the real term is, alas it is not "filamentous" though because yeah that means filament/strand/hair algae. And alas they don't touch hair algae, too bad. But they do go after the slime/film on the glass with gusto.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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