Well I did my first batch a couple nights ago and it went pretty well. I have a few questions about my batch fermenting though. The kit I bought said it made 6 us gallons but the guy at the store said it makes a 5 gallon batch. I do have a 6 gallon carboy so I decided to use that. After I chilled everything and siphoned it into the carboy I added water to bring the total volume to about 5.5 gallons (I decided to go in the middle) so my question is, is it alright to have a gap at the top of the fermentor? I just checked it tonight and about 2 inches of the top of the beer is a much lighter color. Did I do everything correct and is everything working properly??