This coral seems to adjust slowly so is best to place in lower light and medium flow at least initially. The substrate off to one side would be perfect I think for accumulation. From what I remember it is prone to bleaching if you adjust the light to fast so you would need to give it a few months before gradually move it to higher lighting. This coral typically does well with moderate to high lighting and medium flow. Once accumulated you can place middle to top if you have the right position for it that meets its needs. Some people place in high light to get a real vivid color. If I remember correctly Turbinaria Heronesis is actually in the same family Dendrophylliidae as sun polyps are.