I normally feed some freeze dried brine shrimp once a week along with my daily feedings of my few fish. The only changes that I have made are: began soaking food in Selcon, added a KI solution (added 10-15 drops to my 40 gallon, about every other day for about a week, one drop per gallon produces one gallon of .06 mg/L I-), and fed once with Julian Sprungs Phytoplex. Everything else (except the gorgonian) seems to be doing good. I am curious as to the other causes other that stress for the loss of the crown.