Looks like Bryopsis hair algae to me. Certain tangs (ie. Naso) might eat it, as well as lawnmower and bi-colour blennies. In addition, emerald crabs might help as well as some urchins, or a sea lettuce slug. You might have higher nitrates & phosphates that you can't detect because the algae is consuming it, so you might notice a decline with larger and more frequent water changes. If your not using RO/DI (reverse osmosis/ deionized) water, it may be a factor as well...
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