Coral reef

Coral reefs are structures that generate in warm ocean biomes. They consist of multiple clusters of coral blocks, coral and coral fans. These clusters come in a wide variety of shapes, sizes, and colors, ranging from a few blocks of brain coral on the ground to large tree-like structures of fire coral.

Generation
Players can manually load every piece of coral reef structure using structure block in folder coralcrust, example: coralcrust/outcropping1 will load one of coral reef variant structure.

Variants:
 * crust1
 * crust2
 * crust3
 * crust4
 * crust5
 * outcropping1
 * outcropping2
 * outcropping3
 * outcropping4
 * outcropping5
 * outcropping6

Coral reef generate at constant elevation y level. Although they can generate at underwater ravine floor, lowering ocean floor will cause coral reef to not generated.