My secondary primary fermenter is happily bubbling, but I think it's bubbling too well. The airlock I had on it was developing some sludge in it, so I replaced the lock with a blow off hose.
When I did, I noticed that there were bubbles forming around the lip where the hose was insterted into the fermenter. Is that cause for concern that bacteria could enter? If air can get out can't something bad get in?