Not all of them are. And IMHO, there is no such thing as a limited edition coral (nobody is producing only a limited number of that type of coral). Steve Tyree is an individual who gets ahold of corals (often times by being sent a sample from somebody else who collected it and grew it out), if they are bright and colorful enough, he labels them as Tyree. Originally, the only labeled specific corals that he had aquacultured. However here lately, it seems to be more about getting a hefty price for something labeled as Tyree, as he's slapped his name on a number of corals that have been around in the hobby for quite some time.
From what I understand from others who have had issues with them, individual polyps will drop or break off the main colony float and attach and begin growing in open areas, so soon they have spread into numerous areas. I've never actually seen it happen, just heard about it from others. To my knowledge they do not kill off other corals.
worded perfectly man i couldn't have said it any better....1smile1
