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It might be BGA? Although mines was small black tufts, that were easy to get rid of. You can do Tom Barr's method:
1) clean as much of it off, and do 50%+ WC
2) Keep up with NPK ratio
3) do a 3 day balck out, with no light
Even though it has woked for Tom and others! I've BGA, is a cyanobacteria, which isn't a true algae.
Last option: Erythromycin
 
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