Flaxon,
Duncans are great, easy coral to care for. With proper lighting, you don't need to feed them...though it is really cool to watch. I never feed mine. I have 2 different color variations side by side and don't feed them on purpose, though they sometimes get lucky when I broadcast feed my tank, and they grow like weeds. In a year I went from 2 heads on the one to...I think it is around 50 last I counted.