I would use two braces, but get them to space them according to your light setup. Spacing them evenly would probably put them under the halides. If you space the braces evenly the halides will have to be spaced evenly and you will get a spotlight effect. So it depends...do you want spotlight effect or dim ends? Dim ends will make the tank look not as long, but spotlight looks weird imo.
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~ Mindy
SPS fanatic.
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