I have had my American wheat in the secondary for 2 weeks now. I was going to take a reading today and hopefully bottle it. When I took the towel away that covers the carboy I was surprised to see a little bit of foam that has developed on the top. There's not a lot but I thought it would be somewhat clearer and nothing on top since it has had time to settle. Is this something to be concerned about as far as infection or is this just the way Wheat beers are? Cheers