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Originally posted by CrazyBeagle
So that means the light in the fuge should be on when the display light is off???
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Yes, if you want to use your refugium to attempt to control pH swings.
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If it isnt on, does that defeat the purpose of the fuge ??
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No, because pH stability isn't the one purpose of a refugium. Macroalgaes also provide phosphate scrubbing, and allow microorganisms a peaceful, seperage "refuge" to grow and mature before entering the main tank and becoming food.