The Green Star Polyps (Briareum sp.) are a very popular soft coral, especially for beginning coral keepers. These polyps are very easy to care for, readily available, relatively inexpensive, and grow like crazy. The problem most aquarists run into down the road with GSP is their growth rate. They grow like a weed, eventually covering rocks, sand, and even other corals. The polyps can even sting and kill other corals. Keeping this and their growth rate in mind, it’s best to keep these corals secluded on a separate rock.