Originally Posted by MariaAZ
I've read a few stories of airlocks getting blown off the fermenter when a bit of krausen clogged the little holes. If I were in a similar situation, I'd swap out the airlock for the blowoff hose with the other end in a jar of water (I think that's what is used). As for re-installing the airlock; I may be wrong, but I think there are many who just use the blowoff hose through the entire fermentation process.
Yep, what she said. I'd do a blow off because in the morning when you wake up, you don't want any surprises! Put one end in the hole that the airlock is in, and put the other in a container/jar/pitcher of sanitizer. You can leave the blowoff tube until major fermentation stops, then stick the airlock (properly cleaned and sanitized of course) back in.