After fighting this GHA for a couple months, I think I'm finally beating it. Here are some the lessons I learned.
1) Don't try to pull it out of the tank by hand, instead use a hose and syphon it into a fresh filter sock. You can get a brush to help loosen the GHA. I think mine is actually some type of green turf algae mixed with GHA because the roots were crazy strong. But this way is way way more efficient, I removed like 5x more GHA in the same amount of time. Also replace your filter socks often.
2) Fluconazole works. If you have a bad outbreak, you may need more than 1 round of fluconazole and you may need higher dosage to get results.
3) Keep up with the CUC snails. I think I had some snail die off in previous months combined with stray natural sunlight hitting the tank, and that really let the GHA grow out of control. And once it is out of control and past the tipping point, it's like trying to put out a raging fire. They won't touch any of the long stuff, and it is growing much faster than your snails/fish can eat it. Turbo and Trochus snails are the most efficient. I would get a mix of both.