I love to make beer and try the beer I made, but nowadays, I am just not a big drinker. 5 gallon batches are just too big. I am wondering if there is any problem with making 2.5 gallon batches in a 5 gallon fermentor. I would like to have more variety and less volume. I know it is pretty easy to adjust the quantities with recipe calculators, but what about the yeast quantity? What other considerations do I have to consider...timing, carbonation etc?