I agree it is almost certainly cyanobacteria. I had good luck with increasing flow like Bev said, increasing skimming and cutting down on feeding. I feel that basting it may in fact hasten its spread, try it and see what happens.
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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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