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Originally Posted by Gizmo
So I have a fixture w/ 2 65w PC Slots, It came with 1 actinic and one 10000k. Would it not be more beneficial for the tank (esthetics aside) to have 2 10000k bulbs?
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Possibly, you have to make the choice based on the spectral output of the bulbs. Some deeper water animals require more blue spectrum, this is what penetrates to deeper water. Actinics are the easiest (flourecent) way to provide that blue light for things that require it.
So unfortunately the answer, it depends.