I don't currently have a QT and don't have the filter or anything prepared to get one going in time.
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Ah, must learn to type faster.
Oh well. No QT, although interested in any discussion if OP is ok.
Another idea would be a salt dip in a bucket. Needs advice from others.
To be honest as well, I prefer to put really sick fish down rather than risk rest of tank. Just a thought imo imo.