Anyone had any luck getting rid of hair algae?

[freezetyle]

to add to the list of opinions here:
Vinegar dosing along with feeding your fish once every two-three days, scrubbing it with a tooth brush, then siphoning out.

With rocks they you can take out, you can scrub them with a tooth brush and then pour a diluted solution of hydrogen peroxide over the HA (there is a large thread on Reef central about that), just keep up on the gap/carbon changes.