My first batch is in a glass carboy. It's been in primary for about 72 hours at this point and the krausen has subsided. I had a blow-off tube originally, but I replaced it with a two-piece airlock because I needed the blow-off container.
The air-lock was filled with sanitizer up to the line. I had thought it was a line, anyways. The inside piece has raised all the way up and is touching the lid of the container. The bottom of the inside piece is still below the water level, so I feel like, logically, air won't be able to escape.
Is this over-filled? Does this sound normal? It's done the vigorous fermenting, so I'm not really able to use bubbles as an indication. I'm pretty nervous, because it would be very expensive for this carboy to explode in the room it's in.