the difference between the 15k and 17.5k is really nothing. the 17.5k isa little more blue but you really need to look at it to notice. i bought the 3 color types just to test them. i don't think the little differnece makes any noticible difference in livestock. i would go with what you have there.
Jason
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30g Display, 30g Sump, 24" 4 bulb tek light, Reefkeeper 2, Aqua C Urchin Skimmer, JBJ ATO , Tom Aqualifter Pump, 2 Koralia 1's, ECO Plus Lunar Nightlight, Eco 1056 submersible return pump routed through a SCWD
"Take your time. The only thing that happens fast in a reef tank is disasters."
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