There are many types of coral that will make a great addition to your aquarium. Depending on how big your aquarium is and how much live coral you want in it, there are different options that will make a better choice. Some corals, like fish, are very territorial and will have many defense mechanisms that might cause harm to the other live coral in the
aquarium. There are also some types of coral that spread and propagate much quicker than other coral. These types of coral will be better off in larger tanks. Polyp coral propagates easily and should be added to larger aquariums. For example, Green Star Polyps are very popular because it is fun to watch their little polyps sway in the water and will spread quickly throughout your aquarium. Of the different types of coral, polyp coral is the easiest to keep, but you have to constantly watch it to make sure that it does not overtake the tank. One of the advantages of these types of coral is that you can take as much of it out and resell it.
Other types of coral will not propagate as easily, but can still be easy to maintain. One example, The Torch Coral, is truly beautiful with long flowing tentacles coming from a branching skeleton. This live coral is as fun to watch as polyp coral. In general, live coral is easy to manage, as they do not need as much care as other organisms in the aquarium. However, there are precautions that you have to take in order for one coral to be able to live with other types of coral.