I only have 5 gal. carboys. i make 5 gal batches. when i make a 5 gal extract batch, I boil ~3 gal, cool, put in carboy, then top off with cool, clean water. I just top off to within about 2-3 inches of the neck of the carboy. I want to get as much beer as possible.
Is this bad? It does not leave much headspace, I just use a blowoff tube into a half full gallon jug. after fermentation, there is a lot of "stuff" in the jug.
I guess my question is if the krausen is blowing through the tube into the jug, is that effecting my final product? (or, is too little headspace bad for the beer?)
sorry, no pics, but for reference, I have about half as much headspace as this person