I have been wondering what has been happening to all of my coral. I figured that the spark of Black Algea was causing damage to them. Which might have been the part of the problem but I am now leaning towards something else. They are disappearing not dying, so I thought that it might be something else. Well after talking to someone I was told about the Mantis. She told me to listen to the tank and listen for a tapping/clicking noise. And if I heard it then I have a Mantis. Well tonight sitting here in the computer chair I just heard that noise! GRRRRRRRR!!!!!! Is there any advice that anyone can give me? HELP!!!!