Purple Bubble CoralBubble Coral, known scientifically as Plerogyra sinuosa, is a popular Large Polyp Stony (LPS) coral that brings a unique texture and sense of movement to a reef aquarium. Its most distinguishing feature is the presence of large, water filled vesicles that resemble a cluster of grapes or bubbles. These bubbles, which are actually modified polyps, expand during the day to capture light for the symbiotic algae within and retract at night, often revealing