There is only 0.25% of the ocean floor covered with coral reef. It is possible to protect such a little piece of the ocean. In order to protect it, few actions can be taken that can prove to be of great help-
Don't touch the corals, just take photos.
Install more mooring lines to prevent the boats from using the anchor in the coral reef region.
The government should chart out guidelines regarding what should be allowed and not allowed in the reef.
There should be a good waste management system.
No fishing and garbage dumping should be allowed in the reef area.