This work

I dont think a single MH is going to have enough spread to cover a 6 ft tank. If you look at most fixtures, they have 3 MH's with some T5's for supplemental light

You're going to want something like this:
Aquarium Lighting for Reef Systems: Current Nova Extreme Pro Saltwater T-5 Fixtures

or this (this is the fixture I had before upgrading to LED's)
http://www.fosterandsmithaquatics.com/product/prod_display.cfm?c=3578+3733+20394&pcatid=20394

I also have a 180, the most expensive part about a 6 ft tank is the lighting, its far more costly than anything else needed for the tank. I think you'd need at least 2 but probably 3 MH's for a 6 ft tank. If you just run MH you wont have T5's for supplemental color (unless you have a canapy that would let you run both, or you went with a fixture that runs both)

If you're looking into LED's - 3 of the new AI LED modules would be sufficient for the tank as well
http://www.aquaillumination.com/sol/
 
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I was atualy thinking about buy 3 or 4 of the MH and then having 2 vho bulbs. If I did that I wanted to put it something like this:


Center of tank = I
18 inch space MH 18inch space MH 9inch space I 9inch space to MH 18 inch space MH

So kinda
------MH---------MH----I-----MH-------MH-------

Then having the 48inch vho bulbs centerered on front and back of the MH
 
I couldnt beleive how much heat my 3x 150W Metal Halides were putting out. When I switched to LED's my tank temp dropped 3 degrees, I need to get some larger heaters to make up the difference
 
I have the 48" version of this same lighting fixture on a 75g. I have had no problems at all. The output is great and you cant beat the price anywhere.
 
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