I had a nice small colt about 2 inches in size had been in the tank for 2 months was growing real well. Then one day this week I came home from work and it was only about 3/4 of an inch and it looked like it was disinagrating the next nite it was gone. I had added a couple other corals the week before don't ask me what there names are i don't remember but have seen them on here as beginners coral. I also bought a sand star that my kids liked could have one of these things caused my problem/ I hope someone can help this was my favorite coral and I would like to replace it and try again thank you