I'd do more water changes. Smaller changes more frequently keeps the tank more stable and IMO is the best way to lower nitrates. I also have Purigen and DeNItrate (both by Seachem) adsorbers in the tank. My nitrates are always 10 or less.
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12g Nanoreef. Zooanthids, Ricordia, Star Polyps and two clownfish. CF Lighting, 75% actinic blue, 25% 10,000k white.