Others will argue it, but I've seen algae issues go away by getting the bulbs up to date - esp if they are old. Check the chem of course but I saw you mention bulbs recently... I think that restoring the proper wavelenths of light gives the corals the upper hand in photosynthesis. Algaes seem to be more adaptable to light frequencies as they are simpler organisms, hence their tendency to thrive under less favorable light spectrum.
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With fronds like these, who needs anemones?
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