Technically you could do softies with 2 or 3 T5s, but you might as well get a good ballast and do four lights. I prefer growth over color, so I like my tank a little whiter. You could do a 10,000K, 14-15,000K, 20,000K, and an Actinic for a broad range of colors and a blue look with good coloration or you could do 6500K, 10,000K, 14-15 or 20,000K, and an Actinic for a wide spectrum and whiter color.