I would imagine the answer is the same as in marine: limit phosphate or remove it.
Run a fuge 24/7 lighting; it will outcompete the tank for phosphate, which comes from: tap water, dry fish food, live rock, and various other sources. Mostly conditioned tap water. It's algae fertilizer. If you have a good, big fuge, marine-wise, you don't have to scrape algae.
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Sk8r
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