06-23-2010, 04:45 PM
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That's identical to my 90g (90 USg is probably the same as imperial 80g, doesn't matter, close enough).
First thought is that the tube should extend full length (4 feet), or alternatively two tubes end to end, but a 48-inch tube is preferable because they are more widely available in different types and easier to manage, and you will get consistent light full length which will not be possible with two smaller tubes.
A single tube over a 80g is really pushing one's luck; I have had this over a 55g 4-foot, but that is narrower and shallower, and it just cut it. I have two 48-inch tubes over my 70g and 90g and I would recommend two 48-inch tubes.
Now here you have two options; regular T8 tubes, two of them, work well (that's what I have). Alternatively, a single T5 tube would work, in Ho (High Output) a T5 is approximately equivalent to two T8 tubes, with the same "type" of tube [full spectrum, 6500K, etc]. Of these two, my preference is for T8, because then you can combine two different tubes for good light and nice appearance. If you've looked at the photos under my "Aquariums" below my name on the left, I have a full spectrum 6700K tube and a cool white-type tube on each tank; this give excellent plant light, plus a "cool" look which I personally favour because it depends the blues on the fish a bit but not excessively, it makes the plant greens looking stunning, and it has a "subdued" feel to it which creates the sort of environment the fish prefer.