It's mostly just the entrained air bubbles rising to the surface. I leave it on, more natural that way. ;)
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With the way things have been in recent history with bees, being a "bee-haver" can't be such a bad thing. All of my bee journals are always talking about how bad the overwintering is and about how packages will be scarce every spring. If they can survive without your intervention, you are ahead. Bees didn't need our intervention for hundred's of thousands of years, perhaps people could just call you cool.