I brewed a 50/50 Hefeweizen with Lallemand's Munich Classic. It didn't ferment for around 48 hours. I pitched more yeast to see if anything happens. The fermentation started the next day but it's been very slow. Today is day 3 since the fermentation kicked off. The krausen is still there, infact it has become denser and thicker. I've never seen this happen. Is it fermenting slowly or is it a case of stuck fermentation or is it infected or something else?