hey guys. this is the 5th batch of beer I have brewed and I have always done all grain. I usually do 3-3.5 gallon batches and do my primary fermentation in a 5 gallon glass carboy topped with a 3 piece airlock. I brewed this batch monday evening and by very early tuesday morning it was bubbling away. I had to leave town suddenly tuesday afternoon and didn't arrive back home until now (thursday evening) and came home to the photo below. I know this is the sign of a very vigorous fermentation and I will probably use a blow off tube from now on even though this is the first time I have ever had this problem (3.5 gallons in this carboy. thought i had plenty of headspace). My main concern is that I filled the airlock with star san solution. Not distilled water. Is it likely that the sanitizer flowed into the beer? or is it more likely the kreusen absorbed it and forced it out the top of the airlock?