06-02-2013, 11:59 AM
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Romad, without CO2 diffusion a dual T5 with 4-foot HO tubes would be way too much light for your system. I have much the same tank, and when the old fixture gave out two years ago I got a dual-tube T5 with HO tubes and it was too much even for my 5-foot 24-inch deep 115g; after a week I took it back.
For the method you are intending, in fluorescent tube light, stay either with a single T5 fixture (taking a 4-foot tube), or go with a dual T8 fixture (two 4-foot tubes). I have the latter, photo below shows this tank. I limit the duration to 8 hours max, or brush algae explodes. The tubes are one Life-Glo 6700K and one GE Daylight 6500K. The much less expensive GE tubes (or those by Phillips or Sylvania) work fine with two of them.
This is moderate light, which will allow you to grow most plants. Generally speaking, anything that won't manage under this light will probably be better with CO2 as well as higher light. A dual-tube T5 would work if you used NO tubes, not HO. T5 NO is roughly the same intensity as T8 in the same type of tube (6500K, etc). But T5 is more expensive initially. Where I am, NO tubes are non-existant.