Depends on what you want to keep. If you ever want an anenome that light won't cut it. You also have the width factor, a 6 bulb T5 setup would be perfect for your tank and would allow you to have almost anything you'd want to keep.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.