You need to check your phosphate and nitrate levels. The ideal range is as close to 0 ppm. You also need to test the replacement water you're using for phosphates. Make sure it's RO or RO/DI water and not tap.
Get a protein skimmer to remove unwanted DOCs. If you have high levels of phosphate and nitrate do weekly small water changes and buy a product called Polyfilter and install this in your filters. That should remove some.
It also doesn't hurt to make sure your calcium levels are ideal 410 to 450. The higher the calcium, the lower the phosphates which will 'starve' the hair algae you have.
I heard of extreme measures where people remove all their LR and scrub with a toothbrush. This seems a bit daunting to me and comparable to breaking down the entire system and starting from scratch. Regardless, you'll still need to perform the weekly water changes and manually remove the hair algae daily.
You might try reef safe hermit crabs, a lawn mower blenny, and some tangs will eat the stuff. There are also some sea slugs and snails that will eat it.
If you go the chemical route, I've heard good things about Kent's Clean Equation, but this might affect your inverts.
Bottom line is getting your phosphate levels down.
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