- Alkalinity: 8-11 dKH - Calcium: 380-450 ppm - pH: 8.1-8.4 - Temperature: 74-78°F - Moderate to Hard to keep - Description: Gorgonia, also known as sea fans or sea whips, are delicate, branching soft corals that require stable water parameters and moderate to strong flow. They add a unique elegance to reef tanks but are best suited for experienced hobbyists due to their care needs.