A few friends of mine breed them; very cool species of Tang. The one breeding group that I did get to see in person didn't seem very active, which may have been that they were new to the tank. Great looking fish nonetheless.
Amazing to see them in full breeding color. They are becoming more common lately. I picked up Enantiopus melanogenys Ndole group recently. They are pretty shy fish.
Almost anything kept with fronts that are under 4-5" and narrowly built are prone to becoming snacks at one point or another. They can be fine together for years, but eventually, they will try to "snack" on somebody.