Ok, so I had read about overflow but hadn't paid much attention because we didn't have the issue with the first batch we made. Well now I'm attempting to make a batch of Graff and I just walked in to the pantry to see the carboy practically exploding the top off the airlock. There's juice filling 3/4 of the airlock and it's foaming slightly out the top. Do I need to worry about this and if so, how can I release the pressure?