09-18-2012, 12:57 PM
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Several options. First, T8 (the "normal" fluorescent tube lighting). I don't know if there are 6-foot T8 fixtures, so you might have to use two 3-foot dual tube fixtures; depending upon the type of centre brace o the tank frame, this could work.
A better option here might be T5 fluorescent, with two 48-inch tubes. Some of the T5 fixtures taking two 4-foot tubes will extend at the ends to fit 5 and 6 foot tanks. And the brighter light with T5 HO tubes would be sufficient for this tank.
Another option is LED, something I have no personal experience with. It is very expensive, and while initially it was deemed rather poor light for plants over larger tanks, the newer types are getting better. As i say, I have never used it, but I mention it because it is out there.