What are the dimensions of your tank? That makes a big difference in what lighting you use.
Ok so that 5ft long, 2ft wide and 2ft tall.
Depends what your going to keep, soft, mixed or SPS only.
Softies can do well when for each 24" cube, we provide between 150-250 watts. So for your size you need at min, 3, or 450 watts total.
SPS have additional needs so say 4 - 250 watts.
You could also keep what you have and add 2 LEDs.