Yesterday I came home to see that my fermentor was going crazy and foam/yeast/the stuff on top was coming up into my airlock. I use a plastic bucket, so I didn't think it was going to be a problem. So as soon as I saw that, I sprung into action and quickly got a blow off tube going. To do this though, I had to take out the gromit so my siphon tube could fit into the hole. Is it ok to leave the blow off tube during the entire primary fermentation? If not, then I am probably going to have to take the lid off so I can reattach the gromit so I can re-mount the airlock. Thank you all!