I have a botton polyp coral that has been in my tank for about 2 weeks. All my water parameters are normal according to my test kit and also with confirmation at my LFS. My problem is that a section of the coral is turning white and seems to be shriveling and I am concerned. Will this continue to spread to the entire coral and kill it all or what? It is possible that when first introduced to my tank that it was lying on the side that is affected. I don't want it to die. What should I look for? What should I do? Also, there is a white and black attachment at the base of the coral. I think it moves around the coral but I'm not entirely sure. It is sort of discus in shape and I have never actually seen it move but it is in different locations at different times. Any ideas?