The problem is that they tend to eat themselves out of food and then starve to death. It's popular to borrow one until your hair algae is gone, then let someone else have it for a while.
Yes, from my observations, they certainly eat hair algae.
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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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