Like most noobies I got impatient with no fermentation after 24 hours so I popped the lid to check and got a whiff of co2 so I resealed the lid and waited. When I resealed I guess the air from inside blew off the bobber, for lack of a better word, off of the airlock. I saw it this morning, about 12 hours later and put it back on. I had bubbling when I did this so it is fermenting. Did I let air in that could cause oxidation or will the co2 being generated create enough of a blanket so the air couldn't get into the wort.