Bryopsis

I've heard black long spine urchins love the stuff. Also sea hare's but I would not reccomend getting one. They are a great creature but will just eventually die in a short time.
 
Elysia crispata sea slugs will, but in most tanks you'll have to take special precautions to keep them alive. Some herbivorous fish will, but it's VERY hit or miss whether you'll get one that touches it, even within a specific species. My Kole tang rasps it off the rocks, but I got very lucky. Best bet is to do everything possible to get nutrients under control (refugium, carbon, water changes, less feeding, skimming, phosban even if you don't detect phosphate) and then get a creature that you'll like having even if it doesn't touch the hair algae. Good luck

Steve
 
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