I brewed an AG Hefeweizen this weekend. I made a 1 liter starter the night before and aerated it really well with my drill paddle. The thing was going crazy almost within 3 hours. It started coming up through the airlock like crazy and spilling everywhere. I took the airlock off and put on a blow off tube. When I took the airlock off, there was a huge pop from the CO2 escaping. I quickly put the sanitized blow off tube on. Now that high krauesen is over and there isn't any foam coming through the tube, I've taken it off and put on the sanitized airlock again. I have bubbles coming through every 7 seconds.
Here's my question: Do you think that taking off the airlock to replace it with the blow off tube and then taking off the blow off tube and replacing it with the airlock is going to effect my beer? I was clean and sanitary through the process, but I know that a lot of CO2 escaped, so there is a potential for O2 to get in. Now, I have VERY little space between the beer and the neck of the carboy, so I know not much got in. I'm just a little paranoid. Help me feel better.