its a sun coral look up the name on google images. but it requires no lights(nonphtosynthetic coral) and regular feedings of bi weekly or more often. i can tell that it is a hard coral in the pic by polyp formation, and i work in a fish store and i deal with alot of sun corals young and old plus dendrophyllia which are pretty easy as long as you remember to feed every so often. but get me a better pic for 100% identifaction. but im 99% sure that its a young sun coral.