Nährstoffmangel?

Magnesium deficiency. Add some cal/mag to your line up or increase the dosage if already using one. She will also be getting hungry for P/K at this stage too. I can't see any real signs of nitrogen toxicity, the few yellow tips could be the first signs of being hungry for phosphorous. I would expect to see all leaf tips curling under/clawing if it were a nitrogen over feeding issue.

Kein Mangel sondern zuviel Stickstoff durch die Jauche. Das krallen der Blatter und die verbrannten Spitzen sind die Anzeichen.

Its not missing sign, its too much nitrogen sign. Nail polish i think its called, almost verge of overfeeding which leads to toxicity and lockouts. But i see lack of magnesium, that tigery striping in colour, epsom salt or calmag in small doses would be very wise.