Quick question. Doing my first batch (Coopers Aus. Pale Ale) and I've just syphoned into the secondary but I have a fair amount of head space (the instructions said to leave only 3 inches, I've got most of the neck of the carboy).
I called the place I bought my kit and they said to top it off with water but I also googled it and some forums said to NEVER top it off with water.
Any suggestions? Is there a critical time frame I need to do this in?