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That stinks.
Water parameters when you get the chance.
A picture would even be great.
I would look into the worst case scenarios first and try to rule them out. Maybe Google Wasting Disease or Fish TB. Might do a little good to clean out the QT thoroughly after finishing with the fish you currently have in there.
I am assuming that you do not have a QT full of fish and that it is probably not an injury from another tank mate or injury from being netted.
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