A few random tips:
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Every week I manually remove most of the hair alga by my hand but now I am disperate because it grows back after few days
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Unfortunatly this helps it to spread to other rocks
If you only have it on one or 2 rocks, I'd get rid of those rocks. Once it's on a rock, it seems to produce a base that doesn't really die and will always sprout back up given the available nutrients.
While you're getting the water issue under control, you can put some chaeto in the main tank. I'd put it near where the bryopsis outbreaks are.
Even if your phosphates measure "0", it's a good idea to try a phosphate sponge.
Examine your rock regularly for spots where it's starting to sprout up and smother them with some underwater epoxy putty.
If you believe in rock cooking, bryopsis covered rocks would be good candidates
