Hi there,
I battled hair algae for a couple of years trying all of the things you have tried, even an abalone, with little success. The phosban slowed things down, as did all of the other things, but what cleaned out my tank almost completely was a tuxedo urchin. Best $15 I ever spent. In a matter of 2 months, it is almost completely gone. It only took about 2 weeks to see most of it gone, now it slowly nibbles at the rest. It was fun watching it rip the algae right off the rocks and carry it around for a while! And unlike slugs, when an urchin dies, it doesn't take out part of your system with it, like the one I tried. If you are worried about feeding it after all the algae is gone, just pick up some Ocean Nutrition Algae Sheets. They love them!
Good luck with whatever choice you make in the battle.
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