The gunk in the airlock is nothing to worry about. If I were you, I would let it ferment out as is. You just did not have enough head space in your fermentor to handle the fermentation. At least you had the sense to put a blow off on it, unlike me who simply cleaned out the airlock and reinserted, only to have my fermentor blow its top an hour later. That batch turned out fine.
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Cheers,
Rob
Drinking - red ale, Honey Wheat, Chamomile Ale, Coriander Mead., Chocolate Porter & aging 6-pack of Smoked Porter
Kegged - Hefeweizen & 80 minute IPA
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