I have everything spaced in such a way that none of the corals should be bothering anyone. All those corals have been in the same position for months now. Why would corals placement suddenly become an issue when they've been fine all this time? It almost seems like the hammer coral picked up a disease of some sort and it's wiping it out, rather quickly I might add. Dave gave it to me as a gift. You can see from the pic that it was huge and beautiful. So we had it for a month maybe in our tank and now this happens. I have to wonder if it had something brewing in it when we got it and it's now gotten to the point where it's dying off. Things to ponder I guess.