Once an anemone loses all it zooxanthallae it doesn't usually have much of a chance. Sorry for the bad news. You may try feeding it 2-3 times a week to nurse it back to health.
I'd suggest you try that before selling it, the move may be too much for it and it'll just die in someone's tank and kill some other inhabitants along with it.
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It all started with ............. "Finding Nemo"
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