GDA problems - anyone ever have Green Dust Algae?

So- I ran out of patience today and did a 50% water change, cleaned the filter, etc. I also did a paper towel wipe on the top of the acrylic tank (underside) and the exposed acrylic after the water was out and got what looks like all of the algae out. Did it this morning and the green film is gone. Most posts on other boards say that if you didnt get most of it out, it comes back in a couple of hours. Its been about 8 hours and no signs.... also did a bit of a Flourish Excel overdose to see if that would work.

On other boards they distinctly say not to do that as it releases the spores and creates more problems. I'm going to do a 3 day blackout and see where that gets me.

I never had seen anything like it in my many years of doing this hobby. It literally looks like a green version of the protein film that coats the top of the tank.

Came back from vacation today and my tank has a green film on the surface. I've seen the whitish protein scum on the surface before but never this in my years of doing this hobby. Based on what I've read its Green Dust Algae and its tough to get rid of. Anyone had luck getting rid of it? I'm going to do a 3 day blackout and see what that does. I've read that it has a 3 week life cycle and if you don't screw with your tank for the entire three weeks.....even though it looks horrible, it will go away. I've also read that that method doesnt work....

Anyone have any tips?