First thing you need to decide is how far you want to go with your aquarium. fo, folr, or reef. second what kind of fish, corals ect. I just went with the 260w compact flourscent 48" 2 65w 10,000k and 2 blue actinic for my 75 gal but im only going with folr for now. I got it on E-Bay after shopping M A N Y other places here in my town. For me I dont have the money just to buy the first thing that comes along I need to shop for the verty best possible price on the same quality merchandise.