Somewhere between 6500K and 14000K seems to work for most. Some don't like to go above 10000K, but it shouldn't be too much of an issue, though you may not get as much growth under bluer wavelengths depending upon the intensity of the lamp in use. Either way, chances are the mix you have now is fine.
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You've done it now, haven't you?
Current Tank Info: 40g breeder patch reef w/ seagrass; 2-250w XM 10K; Vortech MP40wES & MP10wES; BM Curve 7 skimmer; carbon & occasional GFO
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