I have done a lot of reading about airlock verses a blow off tube. But I was wondering, does it make sense to have both on? I have a carboy cap so I put on my airlock and I started getting a lock of bubble activity and the "foam" is starting to rise. So, I thought what the hell, I'll put on the blow off tube just it case. I guess my thinking is, if I need to pull off the airlock I have a back up in place. Does that make sense? Do I need to get a life? Am I going to ruin my beer? Thanks again for your help.