Hi, everyone - bit of a newbie question, but I have c.20l batch of Dunkelweizen stuck at a FG of 1.018 (OG 1.046) - and I am pretty sure that this is because I added only 1 (instead of 2) Wyeast 3638 smack packs. I misread the recipe, though would add that the Wyeast pack said 1 pack was...