So yeah, if your LHBS is warning against a blow-off, ignore that. You really didn't need one with that gravity and fermentation temp / volume, but it couldn't have hurt anything.
That said, I'm surprised that with the volume in your video, you're experiencing krausen coming out of the airlock. Are you *sure* about the temperature range? 1318 is a very active yeast, but not that active in my experience. If it's closer to 72 -- and keep in mind that the internal temp in the carboy will be a few degrees higher -- it's entirely possible that it will kick up that much head. But you'll also be producing more esters as a result.
Either way, you have a nice healthy active ferment, and what you don't want to do is rack it too soon. Don't go by bubbles in the airlock, they mean almost nothing; take gravity readings instead, and when it has sat for a few days at the same reading, then and only then is it time to package it up.
That said, I'm surprised that with the volume in your video, you're experiencing krausen coming out of the airlock. Are you *sure* about the temperature range? 1318 is a very active yeast, but not that active in my experience. If it's closer to 72 -- and keep in mind that the internal temp in the carboy will be a few degrees higher -- it's entirely possible that it will kick up that much head. But you'll also be producing more esters as a result.
Either way, you have a nice healthy active ferment, and what you don't want to do is rack it too soon. Don't go by bubbles in the airlock, they mean almost nothing; take gravity readings instead, and when it has sat for a few days at the same reading, then and only then is it time to package it up.