As others have suggested, a sea hare is very good for eating up hair algae. While the sea hare is dealing with the symptom, hopefully you've figured out the root cause of the outbreak and deal with that. It may be as simple as outdated bulbs or bulbs with wrong wavelength.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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