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Hello and welcome to R2R! Not only is your duncan very much alive, it looks awesome! As others have said it should open in a few days. The fact that it's as open as it is is a great sign. Either sand or rock placement is fine as long as they get the right amount of light.
Its alive. Just let it acclimate.
Or agitation (proberbly typing error)One thing I noticed your powerhead is pointed down. Make sure you have flow at the top of the water to cause intense ripples so that the corals dont starve of oxygen. The term is called surface tension.