Mine did the same thing, the feathers disappeared for over a week. I put it in the sump and it came back out. Always keep it submerged when you move it's casing. Air will kill it. They are sensitive to being bothered by critters or too much flow. Sometimes it just hides for a couple days and I can't really see why. After I saw that is was happy in the sump I put it back in the display and it's been fine since.
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28gal reef tank
nov 2010
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