What types of coral are there?

* Scleractinia: These are the most common type of coral and are responsible for building most of the world's coral reefs. Scleractinia corals have a hard skeleton made of calcium carbonate.

* Heliopora: These corals are also known as blue corals and are found in deep water. They have a hard skeleton made of calcium carbonate.

* Millepora: These corals are also known as fire corals and are found in shallow water. They have a hard skeleton made of calcium carbonate.

Soft Corals

* Alcyonacea: These corals are also known as soft corals and are found in both deep and shallow water. They have a soft skeleton made of protein.

* Gorgonacea: These corals are also known as sea fans and are found in both deep and shallow water. They have a soft skeleton made of protein.

* Pennatulacea: These corals are also known as sea pens and are found in both deep and shallow water. They have a soft skeleton made of protein.

Other Types of Coral

* Hydrocorals: These corals are not true corals, but are instead related to jellyfish. They have a hard skeleton made of calcium carbonate.

* Stylasteridae: These corals are also not true corals, but are instead related to sea anemones. They have a hard skeleton made of calcium carbonate.