How else to do battle with hair algae

[Slick Fork]

Is this a bryopsis algae? I have been pulling my hair out with that stuff for ages and have recently tried the magnesium treatment. Sorry I can't find the link but a search on this site should give the link to the one on reef central.

I am 2 weeks into it and almost 100% algae free. I had a blenny pass away on me earlier this week but I don't know if the magnesium had anything to do with it. I've been adding it much slower than everyone else did (haven't even hit target levels yet) and my other fish are ok so I'm hesitant to blame magnesium for his death. I did have a small ammonia spike when the algae started dying off as I think the algae was sucking up a lot of pure ammonia and just died too quickly. Otherwise no negative effects.

Another tactic would be to try 3 days of darkness. Again there's a thread on RC and I believe it was in reef keeping magazine a month or two to ago as well so digging it up shouldn't be too hard. People seem to have had good results with that.