- Alkalinity: 8-12 dKH - Calcium: 350-420 ppm - pH: 8.1-8.4 - Temperature: 72-78°F - Difficulty level: Easy to moderate - Description: Psammacora, commonly known as the Sand Coral or Star Coral, is a hardy, shallow-water coral species. It features small, rounded or star-shaped corallites and vibrant colors. Psammacora tolerates varying lighting conditions and moderate water flow, making it suitable for beginners and experienced aquarists. This coral is relatively low-maintenance and ideal for adding visual interest to reef aquariums.