Thanks man! I put it in the basement and it cooled off but now it isn't bubbling nearly as much... Since I added a whirlfloc tablet I'm not too worried about the clarity at this point so I spun the carboy around a few times to re-suspend some of the yeast...
It went from 78 to 66 within a few hours, so I'm hoping it doesn't drop below 60 overnight.
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The temperature change will slow the yeast some, but fermentation should continue. Longer time in the primary will not be detrimental to the beer.