About the only thing that I know that feeds on brown hair algae is Sea Hairs (Genus: Aplysia). These molluscs will strip a tank of hair algae in a matter of days. However, before you rush out an get one, there are a few things that you should know. Sea-hairs contain a dye that is derived from toxins contained within the algae that they feed on. If the sea-hairs feel threatened or get stressed, they can release this dye which has the potential to wipe out your tank. In addition, sea-hairs are annual species with a life-span streaching over a single year. Their growth rates are astronomical. My best suggestiion is to ensure that your nutrient load in your tank is minimal (use some macro algae to export nutrients), with no detectable levels of nitrates, nitrites, ammonia and phosphate. Over time, the algae will starve.
Good luck, Cheers, Chris.
Good luck, Cheers, Chris.