I had something strange with my featherduster I purchased about 2 weeks ago. I planted the casing between some rocks and the feather duster completely removed itself from the casing. It was basically naked. I moved it to a part of a rock nook that had low water flow. Since it did not have the casing, it would not withdraw if it was startled. I've been using a turkey baster and adding a small dose of Phyto-green around the mouth. Just yesterday, when I put in the turkey baster near it, it suddenly withdrew into a new casing it developed - pretty cool. Within about 10 seconds of putting in the Phyto-green, he drew back out. Looks very healthy.