I'd call that one personal preference. I ran 20k for a while and it was quite blue, I prefer 14k. If I were you I'd go to some LFS and check out the tanks that are running MH of course ask what the Kelvin is and hope fully it will make your decision easier. Think of it this way if you don't like what you chose you can change up and have a spare or wait 10 months or so. Good luck
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