From what I know, the small yellow ones are filter-feeders and won't help your hair algae problem as such. I would work on locating the source of the algae rather than just trying to deal with the symptomology.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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