MH Lighting Info

[Cap'n]

Just got my first MH light today! Single ended pendant, 175w, just what I wanted. It's used and came with bulbs intended for a FW setup. So I have a few questions:

1) what are the advantages and disadvantages of using bulbs around the 5000k mark? (keep in mind I have a hair algae outbreak at the moment and am currently running NO tubes for lighting)
2) how high should I place the bulb above the water (24" tank, soft corals and zoos only)
3) what type of photoperiod should I use to break the tank in to the new sun? Will I have to do the same when I switch to a 10,000k bulb?

I guess that's all I can think of right now, but please feel free to add any additional info or tips you feel would be beneficial.

Thanks,
Tim