04-15-2010, 08:40 PM
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I would suggest that before you make the decision on the light fixture, that you decide what kind of corals you want to keep.
LPS (large polyp stony) corals require less lighting than SPS (small polyp stony corals).
With a 29 gallon tank, I don't think you will have to go as far as getting a metal halide, because of the depth of the tank.
I would go with T5's over Compact Florescents, they don't use up so much energy. Personally, I couldn't tell you about T6. My 29G is a Biocube and has compact florescents. My 67 has a metal halide, plus T5, plus Actinics and LED moonlights. I would definitely recommend a fixture that has three stages of lighting (moonlight, actinics, and daylight). Just my recommendation.
Do some research on the corals you want, and their light requirements, and keep in mind that the depth of the tank also plays a part in how much light the corals on the bottom receive.