Strange. I've had black beard algae (and some green) algae since I started my aquarium. A black beard I couldn't get rid of. I added UV light (killed the green algae) and nothing will kill them, I just scraped them off with every water change (I use tap water I know, I know). I added this algae scrub and the green and black beard algae were gone. I add it to every water change and so far so good.
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