The Planted Tank Forum - View Single Post - Under $50 lighting?
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post #7 of (permalink) Old 10-09-2012, 11:17 PM
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A 20H tank is 24 inches long and about 17 inches high, so the light will be about 15 inches from the substrate if it sits on top of the tank. That Odyssea light will give you too much light unless you hang it 5-10 inches above the top of the tank. A Coralife T5HO or FishNeedIt T5HO light would work much better.

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