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post #5 of (permalink) Old 09-01-2012, 01:49 PM
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Join Date: Aug 2007
Location: Catonsville, Maryland USA
Posts: 558
Is this a T5HO fixture? If so, I suspect that is way too much light for a tank without co2. And 13 hours of light is too much. The plant aren't using it for that full duration, but the algae is.

Greater Washington Aquatic Plant Association
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