Green Encrusting Star Polyps Coral Colony

Star polyps (commonly Pachyclavularia, often called green star polyps or GSP) are a type of soft coral known for their bright green, star-shaped polyps that extend from a purple or mat-like base. They create a beautiful, waving “carpet” effect in the aquarium as their tentacles sway with the current, adding movement and vibrant color to reef tanks. Star polyps are very hardy and fast-growing, making them popular with beginners, though they can spread quickly across rockwork.

Care Guide
Star polyps prefer moderate lighting and moderate to strong, indirect water flow to keep their polyps extended and healthy. They thrive in stable water conditions (temperature ~76–80°F, salinity ~1.025, alkalinity 8–9 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm) and are quite tolerant of a range of environments. Because they grow and spread rapidly, it’s a good idea to isolate them on a separate rock or area to prevent them from overtaking other corals. They primarily rely on photosynthesis and do not require direct feeding, though they benefit from clean, nutrient-balanced water.