- Alkalinity: 8-12 dKH - Calcium: 380-450 ppm - pH: 8.1-8.4 - Temperature: 72-78°F - Difficulty level: Moderate - Description: Heliofungia actinoformis, commonly known as the Long-Tentacled Plate Coral, is a unique, large-polyp coral species. It features vibrant colors, long tentacles, and a distinctive plate-like shape. This coral prefers stable water parameters, moderate to high lighting, and gentle to moderate water flow, making it suitable for experienced aquarists seeking a striking, eye-catching display.