I was reading another thread and the advice given on it was that 48ws would be fine for some of the soft corals that didn't need much light. I personally have a 10g tank with the 98w powerquad over it, but the light system it self was around $90 with shipping and handling, but I already had the whole 10gallon setup, so that didn't cost me any money. Good luck and hopefuly someone with experience with that amount of lighting will respond.