Generally speaking, I would consider the following approach in order of importance:
1. Take out your live rock and physically remove the hair algae, use a toothbrush and rinse.
2. Up your water changes to 25-50% for a couple weeks minimum.
3. Review the performance of your RO/DI unit.
4. Feed your tank 50% less food.
5. Consider upgrading your skimmer.
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I'm out. 
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