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There are two "standard" 20 gallon tanks, one 12 inches tall and the other 16 inches tall. Which do you have? If it is the 16 inch tall tank, about the only 2 bulb T5HO light that would not be too much light is an Aqueon/Coralife 2 bulb T5HO. That one would give you about 40 PAR, or low medium light. It would be very helpful to use Excel with that much light.
 
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