I'm brewing my first batch with a brooklyn brew show all-gain kit. I skipped the airlock and left the blow-off tube in place in a pot of bleachy water. It's been there for the past two weeks.
Today, I go look at it to start bottling and I see mold growing on the water that the blow-off tube was plugged into! I guess the bleach evaporated..
And to avoid this in the future, I suppose I should just re-up the bleach every so often?