Yellowing leaves

Ich denke es ist eine Magelerscheinung, die durch eien falschen ph-Wert entsteht....... Ich würde erst mal mal mit ph angepasstem Wasser spülen......

So this could be a bunch of stuff I’d start with water then ph , by water I mean what’s its quality is it a well or say city water , now for ph I calibrate every month , then pot size I water 5-10% total pot volume it’s more likely ph or over or underwater than a stand alone deficiency. Many issues display as something they are not and we tend to try and fix the wrong thing compounding multiple issues

N-def or something impeding N availability - pH or some other nutrient too high cock-blocking it.

looks like it is overfed. the new leaves are dark and rich green. the tips are getting burnt on the new growth as well. I don't think this is a deficiency. Start a diary. log what your feeding them. PH seems to be ok for now. PPM/EC is what I am more currious about.

Looks like Nitrogen deficiency which starts at bottom and moves up. Cal/Mag starts with new growth. Leaves would be much darker if Phosphorus and edges of leaves would be affected first if Potassium. Throwing stuff at her if your soil PH is off or your feeding with improper PH won't help. If your sure PH is in a good range then you can suspect deficiency or toxicity. She needs flowering nutes at this stage as well

oh boy... here's what u have to do: - flush (right after flush u feed with solution below... not after drying) -- add into ur tap water CalMag until it gets 300 ppm --- then add bloom fert till 900 (then when it'll recover u can up to 1100) ---- watering with this solution every time with 20% runoff GL 🙏