I agree with the above! Unfortunately, Purple Tangs are notorious for bullying, and especially so (I wager) if it doesn't have lots of room to swim, is battling for territory, etc.
Maybe since you've already got it separated in the sump, now would be a good time to sell it and replace it with a more accomodating, appropriate fish.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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