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Over the 70g tank I have 1 400 watt with the Lumenarc lll. I use a PFO HQI ballast. The bulb is 11" above the water. Over the 140 I plan to use 2 400s or 2 250s in a canopy that is 20" tall. It will be fan cooled of course. The wife doesn't like the look of reflectors hanging from the ceiling.
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