Yea I've read over it a few time.
Several other posts mentioned
Azithromycin works and actually kills it. It came back with multiple people saying it worked. Requires a prescription but I was able to find some online that doesn't. Will give it a try. If that fails than Silica maybe. Or saying screw it and removing everything that has traces of it from the tank and bleaching it.
From addtional post I saw, it says this stuff gets inside pipes as well and doesn't seem to need direct light to live. So Leads me to consider the antibiotic that. Would treat the entire system. I don't have any fish in the tank just coral and cuc.
I worry about having other alage issues with the Silica dosing. Issues I don't current have. There was also lots of talk about dosing it causing diatoms to bloom as intended but in the aftermath people reported dinos and bad hair alage.
Though just as many people said screw it and just bleached the entire systems.
Just not many indications that anyone actually beat it completely beyond the hints of it with the Azithromycin.