So I'm brewing my very first beer and im up to secondary fermentation. I siphoned the wart into a glass 6 gallon carboy, but it's not even close to the top. There a good 4"/6" between the liquid and the top of the carboy. I read oxygen is bad so I'm not sure what to do, I read online that I can fill it with cold water, but it might dilute the beer. Please help... I'm new at this and I don't want to mess up my first beer
Thanks!
Thanks!