I have I feather duster for four weeks and all was good woke up and found his head had come off. I did not panic I waited a week and saw that it was growing a new head. After a week or so of growing his new head today it lost it again. There is some pulsating zinnia that was getting close to it and a flower pot that is about 5 inches from the feather. Could one of these be bothering it or should I be looking at the fish being a pest? Water changes of done regularly and water is in spec. Nothing else seems to be having problems. Fish:chromisis, blennie, dimond goby, yellow goby, citron goby, firefish, coco worm, maxium clam. Corals:flowerpot, leather, acropora, ricorria, duncan, zoas, frogspawn.