I have the same tank. I use 2 250 watt Aqua Medic pendants with Phoenix 14K bulbs and I get really good SPS growth and colour. I think 400 Watt would give you heat issues. My lights are about 10" above the water. I keep the Acros in the upper third, Stylos, Digis, and Birdsnests in the middle third, and monti caps in the lower portion. There are a lot more all over the place but you get the idea.
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