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Originally Posted by midgetwaiter
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.
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Unfortunately that is incorrect. Full spectrum bulbs contain all the colours of the rainbow. When you go deeper into the ocean the shorter wavelengths are filtered out leaving only the blue. Therefore using only 10000K bulbs will still provide the blue colors, and is in no way detrimental to deeper water residents.