Peppermint shrimp have a bad habit of messing with & eating feather dusters. He may be doing it at night, causing it stress. How are your water parameters? Are you specifically feeding the feather duster live phytoplankton?
No Copper banded butterflies, right? They eat them all up. I've never fed mine either, it just collects what it may. I slightly overfeed so my janitors and filter feeders stay healthy.
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