I have a standard 75G tank(~48x18.5x21.5) mixed reef with a few acans, zoos, chalices, bubble tip anemones, and several SPS acros. My current lights are ok, but would like to upgrade. Right now, I have all of my SPS temporarily placed in the center of my tank so they can be underneath my 4x54 light fixture. I would like to spread them out in my tank and move some near the back side of my aquarium. My guess is that in order to do that I would need a 6 bulb fixture, but I don't want to add too much light for my LPS. I've been told 4 bulbs won't offer the placement options I seek and that 6 bulbs are a lot of light for a 75 and should consider the 6x54 dimmable sunpower so I can lower the intensity to satisfy my LPS corals. Which fixture should I go with...ATI 4x54 or 6x54 Sunpower?