Congrats on the twins! I have one of those too. Makes a great fermenter. Never have to worry about blow off on 5 gallon batches with those things.
When I use mine as a fermenter, I don't use a regular airlock. I just hook up a QD to the gas side and run the tubing down to a bottle of sanitizer. Make sure you don't make the same mistake I made years ago. I hooked the QD up to liquid side and when the yeast began working the CO2 started pumping wort all over the place!
Wayne