I've only just come into this at the tail end but it seems to me like your tank is still fairly new. You need a small amount of nitrates (~5ppm) and phosphates (~0.5ppm) as you and Frogger mentioned. Does the tank get any natural sunlight throughout the day? Is the water you're using for water changes RO/DI? Have you tested TDS on the water you're using for SW changes?
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