Newb here. This is my first batch so I'm extra anxious.
To start off, I'll just say I thought I cleaned and sanitized everything correctly. I used star-san on everything, etc. (I think) I also followed the Brewers Best Irish Stout ingredient kit well.
OK, so here's my problem. Pictures are attached. Picture 1 is right after it was put in the 6.5 gallon carboy. There was 5 gallons total in there. Picture 2 is about 24 hours later. Picture 3 is about 12 hours later. Pictures 4 and 5 are about an hour after that. If you can't tell, pictures 4 and 5, the carboy is completely full.
It seems like the fermentation is going crazy fast. I was worried the carboy would/will explode. The cap popped off so I rinsed it off, sanitized it and put it back on.
Should I be worried?