I battled with it for a long time and I still have a little patch clinging to my Candy Cane coral.
I tried just about everything: 3 days of darkness (wrapped my tank in towels and left the light off) - didn't really do much.
Sea Hares- of the four I bought, only one lasted long enough to put a dent in the algae population!
Vodka Dosing- I wasn't consistent enough with it so it didn't really work.
GFO- I'm running a BRS reactor with carbon and GFO. I'd like to think this is helping.
Feeding- I've gone minimalist here. Just a few pellets a day for my fishes. Coral food very seldom.
What really wiped it out for me was rotating the affected rocks through my sump. I would exchange a few algae rocks up top for clean rocks in my sump. Took months, but it finally worked!!