stopping fermentation thick gooey scum on top

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mac1611

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Feb 24, 2021
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Brewng a Soloman Grundy done loads before but all of a sudden stopped fermenting with a long way to go ,so gave it a stir waited 24 hours still nothing .Opened it up to find a thick gooey scum on top ,skimmed it off with a slot spoon now started fermenting again !! Anyune any idea why this happened ?? Appears to have been suffocating the fermentation ???
 
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