For a 75 gallon if you are looking to have corals and fish I would highly recommend T5 HO
. Easier on the electrical bill than MH
and you dont need a cooler. I would get a 4 or 6 bulb fixture, 4 will be enough depending what you want to keep. Best bang for your buck would be a Tek Lighting System. This will run you about $500 with bulbs and mounting legs. Then you can always add LED
strip later on, or go with moonlight effect LED
from Reefkeeper (very nice). That would be the absolute best way to go.
Nevermind ATI, too much money and doesnt to anything extra. If you absolutely want cooling fans go with the tek elite.
So here www.sunlightsupply.com
go under fluorescent lighting, T5 and you will see the TEK's. I also recommend going with Giesman bulbs or something from the US, do not cheap out and get china bulbs.