Blätter hängen und haben Nährstoffmangel

Couple of things here... first is why aren't you giving them any grow nutes? Why only bloom nutes since they're still in veg and you haven't flipped them yet? They're missing nutes that are contained in BioGrow! Secondly, the leaves look very puffy and that's a sign (as well as the droopiness) of overwatering... Make sure you're only watering/feeding when the soil is completely dry as they require a wet/dry cycle for optimal growth. Third, if you think she needs more potassium (I'm not sure I agree but...), you can always give her a good PK boost... but get the grow nutes back into her first! Good luck!