If you get the 12, you may not have great light spread unless you hang the fixture above the tank. I think that's all you'll need but some others will likely chime in.
STS: I was surprised by the intensity of the FugeRay. For instance, the 20" is so much light on a standard 10gal tank that I have to use a few layers of window screen to dampen things so I don't have algae issues.
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