My father just came home from a tropical vacation and to my suprise brought me home a few gifts. He purchased some dead coral skeletons that he wants me to put in my reef tank. One of them has obviously been dyed blue but the others are white (bleached). He claims that the person that sold them to him said they are safe for aquariums. Im not so sure I want to just stick something like this in my tank without checking. His heart is set on seeing them in my tank. Are they safe or do I need to treat them somehow first. They may look a little weird at first but once the coraline grows on them they may look cool.