Coral needs to be in warm temperatures from 68-82 degrees Fahrenheit, that is why it needs to be by the surface of the water so it will be by the sun. Coral is not just a plant, it is also a home for the fish that are around it. Coral is protection for the fish. But fish are losing their homes because coral is in danger. It is in danger because of human activity. Another threat to coral is how the temperatures of the oceans are changing all the time.