Great, thanks again for the info guys. I did look at some photos of exploding beers. Does not look fun. I was going to use a bottle of vodka and a tube running from the airlock hole in carboy, but I couldn't get the airlock off. So I decided to leave and hope for the best. I figure I have enough room (for now) in the carboy, but it's definitely moving up.
I'm engaged, we own a house, and have a Siberian Husky (dog). If the beer exploded my dog would freak out (then probably drink the beer) and my fiance would take what's left of the beer and move it outside she said. Then, of course, I'd have to clean it and listen to her yelling in my ear whilst cleaning. Doesn't sound fun...