are you getting good skimate out of your skimmer ? the fight against hair algae is nutrient control and good lights... What do you have for corals etc in your tank ? is keeping the lights off for awhile an option to help knock back the algae ?
You can also try to mechanically remove as much as you can by taking the rock out of the tank , scrubbing it with a brush and then rinseing it with fresh salt water before putting it back in the tank... If nothing is growing on the rock you may have to take the rock out , bake it and put it back in... I would first however try to limit nutrients and make sure your lights are not old and in the red spectrum. What is your water testing out at ?
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