Light for my 20 gallon tank

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That light will be sufficient for most corals. :) I have a couple of those cheap fixtures and have never had any issues with it. I do change out the white bulbs tho for higher quality bulbs, they look better and I would think produce a better light for corals.
 
Make sure that fits. Most 20 gallon high tanks are 24" long and 20 longs are 30".
 
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