If it's just on the one rock I would be tempted to take it out and give it an acid bath in some hth. Although I have had similar algae to this over the years and it never seems to get out of hand.
very hard gut line like feel to it.
must take it out by the root. Else it just regrow. Hardly any fish eats it as well. It will even survive a few days in absolute darkness.
Medium flat screwdriver to dig out the root part does work.
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