From what it sounds like your rocks are leaching phosphates, and those phosphates are feeding your GHA.
Your options;
1) Trim it back frequently, scrubbing with a brush
2) Make sure your lighting isn't too old. Yellow light can feed different types of macro algaes
3) Try some living solutions; urchins, snails, foxface, seaslug, etc.
4) Do nothing and let it work its way out naturally (takes about 6 months per my experience)
5) Cook it if you like, but seriously the dark did nothing for me
6) Try running phosban or GFO (granular feric oxide), and carbon or GAC (granular activated carbon)
7) Try dark periods over your tank. E.g. a weekend with lights out and towels over the system.
8) Learn to love it.
I waged this battled for 8 months, so I know all too well where you are coming from. I wish you lots and lots and lots of luck. You can search for GHA or Green Hair Algae and you can find a few threads that might be of use to you.
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