I'd go even further and add that they do not need to be torn or physically damaged to deteriorate or rot away. There are many theories as to why the Elegance coral (Catalaphyllia jardinei) dies in the home aquarium ranging from bacterial, viral, and fungal infections, the depth of the area of collection...it goes on. They are not a coral that should be kept in the home aquarium or even collected, unless their collection is for the purpose of diagnosis. Hopefully soon we will start to see some results from recent studies.