I recently lost a patch of about 30 dragon eye zoas. They has growing and spreading quite happily for over a year. About a month ago I noticed there seemed to be fewer. Over about 2 weeks they all disappeared. I noticed that some of polyps had small white spots. I chalked this up to unknown causes and didn't freak out to bad. I have heard of random die offs. But tonight I noticed that another patch of my zoas look like they are thinning and have small white spots. The ones with spots are all closed up. Now I am concerned. None of the large inhabitants should be picking on the zoas. I am thinking some sort of pesky hitchhiker or some sort of disease. I am kind of ruling out chemical warfare since the effects are very isolated. Any ideas on what could eating my zoas?