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I don't remember seeing any fixture under 20" that could support coral. You could get a 20 gallon high like I have it's only 9in. wider. With that there is a wide range of lights you can buy. If you didn't get coral and only had live rock and fish you could get by with a standard full hood or striplight on the hexagon-style tank. Maybe someone else has come across a fixture that would fit a hex tank like that.
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