I want to start brewing all grain BIAB 2.5 gallon batches. The reason for the 2.5 gallon batch is because I'm thinking it would be easier to do with the BIAB method. Also, easy to convert 5 gallon recipes. If the batch isn't the best I will end up with 1 case instead of 2. If I brew a batch I like a lot I can easily convert to five gallons and brew again. Anyway, my question is, I only have a 5 gallon carboy and two 6.5 gallon buckets at the moment. Can I ferment 2.5 gallons in the carboy? Or is that too much head space? I'm thinking as long as I leave it in the primary it should be ok, given the CO2. Is that right?
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