White film on top of beer

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CaptZav

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I brewed a dry Irish stout (~5%abv) awhile ago, bottled 3 gallons, and then split the remaining 2 gallons into 2 separate 1 gallon carboys to age with 1/2lb of frozen cherries I bought from whole foods. The initial bottles were really good, but I recently checked on my aging remainder and found that one of the gallons has a white film at the top, and the other does not. I am normally pretty meticulous about cleaning and sanitizing equipment. I have done some searching and it seems to likely be some lactobacillus infection, but I am still a little concerned. Does anyone have any experience or suggestions relating to this?
 

Bensiff

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Tossed in cherries...probably got yourself some bugs from them; but, I'd tend to think brett would survive better than lacto.
 

djfriesen

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Ya, since it's only in the one fermenter, I'd guess it came from the cherries, or they would all have the pellicle. As stated, I would think Brett would have a better chance of taking hold in an already-fermented beer. IIRC, unless the lacto was there from the beginning (ie before fermentation), it would probably have trouble getting going in the alcohol. Don't quote me on that though.
 
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