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Old 08-22-2016, 03:14 PM   #1
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8 hour photo period?

We have a 38 gallon aquarium that's been set up for years. Most of the coraline algae has disappeared, rocks are mostly white, but covered with a brown mat with a few green hair algae tufts . I perform weekly water changes and test regularly - water quality always tests where it should. I'm wondering about reducing photo period to 8 hours - currently it's 12 hours. Should the lighting be adjusted over time or all at once (we only have zoas & palys for corals)?

Will our coraline come back with reducing the lighting schedule?
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Old 08-22-2016, 03:52 PM   #2
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where are you at with your calcium level , I've had coraline turn white on me but it always came back after raising the calcium
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Old 08-22-2016, 04:04 PM   #3
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Calcium is 440ppm
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