After fermentation is complete you transfer the beer to the secondary fermentor (carboy). The term secondary fermentor is confusing. I think it should be called the aging carboy or something like that.
Since your fermentation is complete all your beer will do there is age, mellow and clear. There should be no additional fermentation taking place, therefore no need for a blow-off tube!
You have no reason to worry, just make sure your beer is done fermenting before transferring.
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Primary: None
Secondary: None
Bottled: None
Drinking: Schwarzbier, Raspberry Celebration, Northern English Brown, Carty Cascade Pale Ale - Vintage 2009, Maibock Pale Ale, 1120 IPA
Next: Simcoe IPA Bohemian Pils? Classic American Pils? Robust Porter? Dunkelweizen? Blonde Ale?
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