Figured it out. It was too cold. I had been keeping all beer in the basement because it is colder, but it's been particularly cold out.
The thermometer had dropped to 62.
I put it in a warmer room and it's up to 64 and has started bubbling again.
I appreciate all the help and concern.
Interesting. It has been about 24 hours.
Could there be any other causes for stuck fermentation other than lack of aeration?
It has not gone bad. Tasted exactly how it should except sweeter of course.
Thanks for all the replies everyone
Oh I'm sorry, I was holding a conversation while typing that up. It has completely stopped fermenting after four days. Dry yeast.
Stirring, cool. Someone said it. That's all the confidence I need!
I'm new to brewing with about 12 batched under my belt.
A few days ago, I started very late in the evening and made batches one after another. So I finished early in the morning and because I was tired I did not pitch my second batch other than pouring the wort into the fermentation vessel...