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So I have a 25 gallon with some stem plants and crypts. I have a 2 bulb t5 no and I was wondering. If I use one 6700K and one 10000K would that be better than 2 6700K?
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It really doesn't matter. While there is some output difference between bulb manufacturers, there's very little difference between different temperatures of bulbs. It's largely a matter of personal taste and not a matter of what's best.