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All of those lights are HO so you would need CO2 of some sort.

The Coralife fixture is the only one that has 30" bulbs the other two have 24" bulbs. So you would have some darker spots on the ends. It won't be anything bad but I'd go with the fixture that offers full coverage. You will need to switch out the Actinic bulb though.
 

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Yeh, t5 HO are very bright. My new 108 watt seems as bright as the 2 175 watt metal halide pendents that they replaced.
 
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