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Old 09-22-2006, 08:43 PM   #1
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brown/bronze color snad

I have a 210 gal reef tank that is a year old with a 3 to 4 inch sand bed.
Everything seems healthy - rock - coal - fish - inverts however my sand bed has developed a brown/bronze top layer covering about 30% of the sand surface.

Is this something I need to be concerned about?
Should I try to remove it?
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Old 09-22-2006, 08:46 PM   #2
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When did you change out your lights?
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Old 09-22-2006, 09:25 PM   #3
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I changed my actinic bulbs last month. I have not changed my MH bulbs yet.
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Old 09-22-2006, 09:47 PM   #4
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I have two sand sifting gobies that turn mine all the time and it turns back to white.
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Old 09-22-2006, 09:49 PM   #5
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Can you increase the water flow in the affected area?
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