I'm also finally winning mine, ever since I moved the 55 about a month ago I had developed hair algae on my alternanthera reineckii and bits on some hygro sunset, but all my other plants were fine. Well I pruned the hell out of the reineckii and pruned some leaves on the sunset, all seems to be doing well now the new sprouts and leaves have been staying algae free.
But the real reason for this post was on a theory and only a theory I just recently got from looking at my tank. I looked at the position of where those plants were located and found that it was only right around the center of the tank under the brace where the water flow is less. I spaced out the stems a little more. I think they were too thick and causing dead spots for the algae to cultivate and spread. But that got me wondering....maybe water flow could help control hair algae? I'm not saying it would get rid of it, but if you had a constant laminar(smooth) flow over the plant it would help to keep it from spreading. Just a shot in the dark???
55g planted tetra & sunfish tank & 55g reef
29g baby angel tank & 20L salt holding tank