I currently have a 55 gallon reef tank that im lighting with a 48 inch 4 bulb T-5 ficture. I have loved the par and coverage of the light but do not like the cost to run it or how much it heats up the tank. So i have been looking for used led lights, i just found someone selling Radion Xr30 gen 3 lights! Would I need two on my tank or would one work? Thanks