Blätter verfärben sich

KI helps a lot! https://ottcouture.cloud/ It helped me 😀

Calcium or magnesium depletion. During the start of flowering, plants pulls nutrient from leaves to flower. It is too late. Next round, try feeding more calcium and magnesium since the start. Improvement can be made. But calcium is and immobile nutrients. Putting it to the root will not help. So you will have to spray cal-mag on the leaves.

Calcium/magnesium/potassium deficiencies all together at once.

That looks very much like a calcium deficiency to me. Check your pH level, and if everything is fine there, it's best to try to get a little calcium into the watering water or the soil. By the way, eggshells are a good and sustainable source of calcium.

Looks a bit like cal mag deficiency to me.