Originally Posted by J187
Don't people do half batches in their carboys all the time?
From what I've gathered, reading posts on here, it seems that if you made a half batch, kept it in the carboy as a primary and had plenty of CO2 sitting on top there wouldn't necessarily be a problem. Racking to a Carboy as secondary with a large amount of headspace and little to no CO2 blanket might be inviting the chance of some wild yeast or pollutant to join the party.
Having said that, I think I have read some posts that advised against doing a primary with too much headspace, but that might not have been fermenting in a Carboy.