Yup- Star Polyps (aka Briareum, sometimes you still see it referred to as Pachyclavularia). Its essentially a type of encrusting gorgonian. In the right conditions it will spread very quickly (some people find it to be invasive- some really like it). It will handle a pretty wide range of tank conditions, though IME does best in moderate light and moderate to strong water flow. Keep your water chemistry in good shape, and it should be fine for you.