I'm thinking about doing 2 ATIs with 3 Kessil A360x for shimmer and coral pop on a 72x30x30 mixed reef, LPS heavy. My other choice would be Kessils with Reefbrite. Do you guys have a recommended mounting height for the ATIs over a tank with these dimensions? I could potentially use the 55° reflectors, but I prefer the shimmer without a reflector.