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youre gonna get better growth on 10Ks because they have a higher PAR. The higher K you go, the lower your PAR will be. Most places use 20K lightsing because it helps pop the colors of the corals more. If you like what your tank looks like, I'd say stay with it...but if you want more blue, there are always many other alternatives. Lots of people on here seem to really like the Reeflux 12K
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