Green Bubble CoralGreen Bubble Coral The Bubble Coral has a green or white ridged hard skeleton that can be seen when the polyps are deflated. When inflated, the large fleshy polyps will cover the entire skeleton, and are green, white or yellowish in color. Like many other LPS corals, they do posses sweeper tentacles that can harm other corals within reach. Scientific Name: Plerogyra sinuosa Diet: brine shrimp or micro plankton Approximate Size: 2 to 8 inches