I have three of them. And in the beginning i thought something was wrong too. But as it turns out they go thru what I call a "re-feathering" phase. Where they lose or shed the "feathers" and re-generate new ones. But from my experience and observations this can take months. I thought mine were long dead for months and just left the tubes in the tank out of lazziness and all of a sudden one by one they reappeared with smaller feathers, which eventually grew back even prettier.
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