Blätter hängen

Looks like your over or under watering it. The pH shouldn't affect the droopiness of it.

To get more accurate considerations, we might still need a few more infos :-) Did you transplant the plants, and if so, when? What is the humidity level? Have you checked the pH level of your water, or does the 6.5 refer to the manufacturer's specification? How did you feed them and with what (EC value)? =D What wattage does your lamp have, and how far is it from the plant? My first impression would be stress from transplanting and too hot soil =) But like I said, a few additional pieces of information would be helpful :)

Hi, it would be better for you to create a diary where you can give as much information as possible about your cultivar, otherwise, it’s impossible to help you(imho). There are skilled and very helpful users but I doubt they can tell you much just by seeing photos or knowing that your soil has a pH of 6.5. Do you give your plants little water? too much water? are you feeding her (fertilizers)? These are the first questions I’d ask you. It would be useful for those who want to help you, know if you grow indoors, what kind of light you use, how many watts, ph of the water. All valuable information you could put in your diary 😉✌️

I'm not a pro but from what I know when your leaves hang down like that it's giving you signs that either she's not getting enough nutrients or maybe too much nutrients. Or maybe underwatering. :/