Brewed a Belgian with an OG of 1.073. I used Safale BE-256. The temperatures in my basement dropped lower than usual at this time of year to 58F. Fermentation stopped at 1.020. I moved the fermenter, gently shook it and got it up to 68F and still at 1.020. Beersmith estimates FG to be 1.012. Any advice to whether this is a stuck fermentation or just a beer that finished a little high? I am contemplating throwing another pack of yeast in. I should also mention that I brewed this beer two other times and ended up at 1.010 and 1.012, but the temperatures did not drop below 62F. Thanks!