Here is my experience.
I got the hair algae from a frag's plug which spread all over one side of my tank. I checked my parameters and everything was in normal ranges. I tried 5 day blackouts, increasing my CUC, changing my phosphate media, manual removal (ended up spreading the hair algae more) and big water changes. Following SunnyX advise, I added a pump to my sump and my skimmer efficiency was doubled, now I have to clean it every 3 days :thumbsup:. but this didn't help getting rid of the HA.
I was about to tear apart the tank and start all over again until I found this thread and decided to give it a shot.
I dose every 3 days as directed by the manufacturer, didn't turn off anything (skimmer, phosphaste media, bio-pellets, lighting period) and I didn't do any manual removal while dosing.
After 7 doses I have to say this really works and I believe I have it under control now. Today I added more turbos and I will keep and eye on my parameters, which I also tested today and are normal. The only side effect so far is part of my chaeto died. I will stop dosing every 3 days, and start dosing once a week sine I don't want to kill my macro-algae.
Dose 1
Dose 2
Forgot to take pics.
Dose 3
Dose 4