There are numerous threads - and numerous discussions.
First - what is your definition of QT - is it observation? Is it Observation with medication if sick? Is it QT with multiple medications?
Depending on which version of 'QT' you are asking about - there is a different answer.
Second - what is in your tank now? Is there any other history of disease? I'm assuming that CBB - means captive bred fish (normally thats an abbreviation for 'copper band butterfly'). If there is a possibility for disease to be present in your tank without knowing - I would make sure that the fish is in great health, eating, etc - before putting him/her in - just to avoid your fish transferring something to it.
Third - as a captive bred fish, that should not have been exposed to diseases. So - if its healthy, etc - and assuming you trust your source (Algaebarn) - its probably safe to add directly to your tank IMHO
You will probably get 8000 opinions. These are my thoughts