Hydnophora is more commonly known as the Horn coral. The Neon Green Hydnophora is maricultured by ORA in the Marshall Islands. Hydnophora are among the more aggressive hard corals. Hydnophora should not be placed close to other corals due to their aggressiveness. Although Hydnophora are more aggressive than most other hard corals, they make up for it with their uniqueness and beauty. The ORA Neon Green Hydnophora is just that, neon green. The polyps on the Hydnophora are stout, and more brown in color. Hydnophora require high lighting and strong water flow, as well as the addition of calcium, and other trace elements.