03-16-2013, 07:23 PM
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You should decide the sort of tank you want before choosing the lighting, and you seem to be thinking low-tech or natural. The 75g tank will presumably be 4 feet in length, so a fixture taking two 48-inch fluorescent tubes is going to be your best option.
This leaves you with T5 or T8. The "T" refers to the tube diameter, but they are not interchangeable because they need different ballast systems. And T5 can be much more intense lighting than T8, which would be fine over a high-tech method. I have T8 tubes over my larger tanks and the photos below show the result. And these are inexpensive "daylight" 6500K tubes made by GE and Phillips.
I wrote a 4-part series stickied at the head of the Aquarium Plants section entitled "A Basic Approach to the Natural Planted Aquarium" which sets out the method used in these tanks. The substrate is Quikrete Play Sand. I use substrate fertilizer tabs next to the larger swords, and weekly liquid fertilizer.