I am going to have to disagree with Tecwzrd on the MH
recommendation. Personally I think MH
lighting is the most unrealistic way to light a reef aquarium. In fact many tried and true experts feel that VHO
Flo. lighting is far more efficient. What I do not like about MH
lighting is this; first it gets very hot, second it uses a lot of electricity, and third it is a very pointed light source meaning that it focuses on a portion much like a direct beam of sun.
If soft corals (leathers, colts, star polyps, xenia) etc are what you aim to keep 1 watt of lighting per gallon is not enough, although 3 watts per gallon of T5 HO
lighting is enough. Soft corals will often die from over illumination in the reef aquarium, and MH
lighting can easily over illuminate soft corals.
In my opinion your best course of action is to stick with T5 lighting, it uses less electrical power, creates less heat and the lamps produce light with a higher Kelvin rating than PC
lighting. Not only that soft corals should thrive under that type of light. Current USA makes a NOVA T-5 HO
light fixture that has 8 54 watt T5 lamps. That is a total of 432 watts, more than enough for your scenario.
In my tank I am running that fixture but added a MH
lamp. The reason I did this is because I keep Trinidicha clams and a few SPS
corals. If you plan on keeping SPS
corals, T. Clams and those type of light heavy animals then you will require MH
light, otherwise stick with the T5.