So I've just finished my 3rd all grain brew yesterday, first time trying a stout.
After 24 hours, I'm only getting ~4 bubbles per minute on the airlock.
Last night about 8 hours after pitching the yeast there was practically no activity so I'm thinking the yeast could just be slow..
I'm worried about that the yeast activity won't pick up sufficiently if it hasn't already.
Also there is there is a little bit more empty space in my fermenter than I've had in previous brews, could this be a factor?
Temperature is pretty constant at ~21c