LPS or Large Polyp Stony corals are a large family of corals that come in a wide variety of colors and styles. They are popular for their vibrant colors and ease of care. With such a large family of corals, it is crucial to know the difference between each type of coral before you buy. All LPS corals have a calcium carbonate skeleton and large fleshy polyps or bodies. LPS corals are popular due to their large selection and multitude of color options.