What lighting would you suggest?

[dsaundry]

I have a 34g cube and with the substrate it is about 18" deep, I have a 70w mh pendant with a marineland l.e.d set-up that goes with it. the question is what bulb for the 70w pendant? 10,000? 14000, 20000 or 30000k. I am not putting any sps in the tank, softies only. So what would you suggest and why? Colour?? more blue in spectrum?? Right now this tank only has pc lighting with the l.e.d. set up. Look forward to all your suggestions.