Braune Spitzen in den Zuckerblättern

I’m guessing it’s not an optimal pH level. Since the rest of the plants look very healthy and well-fed, I would adjust the pH to around 6.0-6.2, which would be good. Other than that, very nice babies :-)

I would drop your pH to 6.2 and add some calmag while reducing your Biogrow by half. She's probably starting a calcium deficiency .... usually brought on by either a nitrogen toxicity locking out the calcium or your pH being too high (yours really isn't but 6.2 would be a better reading for calcium absorption)... From the looks of the photos, though, I don't think you have a lot to worry about.... just a slight adjustment... wish you had a diary for this grow! She looks to be very interesting! Good luck!

I have a suspicion... But I'm hoping for suggestions and more opinions. The plant seems otherwise perfectly healthy. There are no issues visible on the lower leaves. The brown tips and spots are only on the flowering leaves.