Holy… I’m surprised meds didn’t work.Once that stuff gets to a certain length nothing will touch it.
Regardless of the negative press I used Vibrant twice in a forest of algae that makes your tank look like an algae lint ball and it worked and it did not harm anything in my tank including shrimp, urchin fish and corals.
It took 7 weeks the first time but after a few weeks the GHA started sloughing off in huge chunks.
But whatever the underlying problem is has to be addressed or it will return.
Here's a pic of a small portion of the grass field I had. It's been gone for 8 months or so. Hope this helps!
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You’ve already diagnosed the type of algae it is?

