New Black Beard Algae growth?

[tk_yt]

I’ve had my 40 gallon breeder for almost 4 years and at one point my spiderwood got black beard algae on it and I never bothered taking them out.  When I got mollies in the tank recently I saw they were actually eating them so I was happy just leaving them alone.  But then about a week ago I saw fresh new patches in the midst of the old black beard algae, and they almost look like moss!  Wondering if it’s because the mollies ate the old ones and new ones simply grew back longer and more green.  It actually looks kind of nice, but the question remains:

Is this just new black beard algae growth? Or looks like something else? 🙂

[Fish Folk]

That doesn't look quite like "black beard algae." Here is what it typically looks like:

As for remediation . . . good luck. If you get this, it's with you to the end. I've just given up, and embraced it . . . sort of. I do keep _female_ Florida Flagfish to nibble away at it. Watch the black carpet in this video . . .