Okay -- I just had a chat with the guy at Aquacave and ordered 3 AI fixture kit but I got 3 12 inch set of hanging rails so that I can hang the lights the long way over my tank versus the way the longer rails make you hang the lights. As my tank is a peninsula most of my corals are in the center. They will come next week... bye bye aquatinics fixture.
keep us posted, i want to hear how well 3 units of ai will perform over a 180G.