I am brewing apple wine. There is a layer of white foam forming at the top. Shall I remove it or it is ok to leave it like this?
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looks fine, I don't think you need to do anything at the moment. – Mr_road♦ Feb 15 '17 at 17:28
IMHO this looks like a normal and vigorous fermentation. There is no need to disturb it or remove any foam layer. My advice would be to leave it alone for at least a month (if not 2 or more) and then see how it is doing.
It looks like the carboy on the right has had a very energetic fermentation!