Human has been blamed for all the coral bleaching around the world and that's somewhat a threat to those of us passionate about this hobby because of the actions considered by world government body. Not often were Crown of Thorn Starfish ever brought into the picture, since they are responsible for massive coral destruction. Here's an article that bring some hope just in time for the holiday Scary smell may help save corals ? Advanced Aquarist | Aquarist Magazine and Blog. Hopefully we can go after invasive lionfish next.