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How often should I change my 250 watt metal halides? I'm using Phoenix 14K bulbs on I believe a pulse start dual magnetic ballast.
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120 Gallon Acropora dominated tank, barebottom, APEX Controller, ATI Sunpower 8x54w, Skimz SM163, Jebao DCT 6000 return pump & two Jebao OW-40.
Current Tank Info: SPS Dominated
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