Hi and welcome to AA!
Are you planning on having live plants in your tank? If not, then a standard fixture w/ T8 bulbs should suffice, (although it may look a little "yellow"). Otherwise, a 48" T5 fixture w/ 1 Actinic bulb will make the colors really 'pop'! This
is the fixture that I have over my 55g planted community tank and it works great! Although, I needed the full 56w for my plants so I changed out the Actinic w/ a 6700k bulb. But when I did have the Actinic bulb in there, it looked incredible!