Nitrates and Phosphates. Phosphates can be eliminated with the Phosban reactor you've already considered. Although you can't measure much nitrate, that is likely because all the algae is consuming it.
Maximize your skimmer to eliminate the N before it becomes nitrate. Use a refugium to grow macroalgae in a place where you can easily harvest it.
Manually remove as much hair algae as you can and be patient.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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