Lagering and O2 exposure?

[Dabba]

I don't know why I didn't think of this before but I just lowered the temp on my two lagers in my chest freezer down from room temp to 34F. I've been checking on them periodically to make sure they're not sucking the starsan from the locks into the beer. They are not, however this morning I noticed one bubble backwards once. This should have occurred to me with the rapid temp change. Do I need to be worried about this? Is it enough to affect the beer? I can try to find a stopper for the carboy but not sure how I'd seal the bucket. I'm hoping there's enough co2 still built up to be protective but I left the lid open for a while so likely not.

 

[Dabba]

Monday morning bump

 

[passedpawn]

You'll be able to drink the beer - don't worry

Any O2 will have an effect. But for most of us (me), it's not that bad. I get a little suckback when I crash my lagers to 32F. I also don't always do CO2 transfers when kegging.

There are some nifty ways to avoid all 02 (suckback, oxidation during kegging). There's a whole section of this forum dedicated to ways to do this.