Most leather corals appreciate a good amount of flow. They slough off mucus periodically, and if the water flow is moderately strong they will expend less energy during this process. In your 200 gallon tank, you probably won't see an issue, but they are also known more than other corals for broadcasting toxins to chemically compete with other corals. As I say, this likely won't be a problem for you with adequate filtration and water changes, but it's worth mentioning. Good luck!