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Reef Aquarium & Tank Building Forum

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    which lighting setup is better??

    I have a 40 gal breeder tank and i have 2 175watt 10k ushio metal halides and 4 65 watt Power compacts from my old system to use. Which do you think would be best setup for clams and hard corals? 1- use 2 175 MH or 2 - use 2 175 MH and 2 PC 1 for actinic and 1 for 7500k to do sunrise...
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