Potassium excess, PH or calcium?

calcium. also make sure your water is dechlorinated. if you have any other questions, feel free to message me 🤙

potassium or/and calmag deficiency.

Plants do not "direct" energy anywhere..........healthy leaves, damaged leaves all get their share of energy. All energy gets used equally throughout the entire plant, there are no brains deciding where energy should flow. There is no need to prune off damaged leaves until they are completely yellow. Damaged leaves do not "eat up your plants' resources" either..........leaves store resources for the plant to use. Damaged leaves will be recycled by the plant, providing the plant with a ready made store of building blocks. Remove the leaves , you also remove this vital resource of pre-made goodness. The damage is minimal, isolated near the lower areas around the fan it seems..........why worry too much. If it were nutrient related, the issue would be wide spread and affecting leaves over the etire plant. It is most likely to be mechanical damage caused by the leaves rubbing on the pottters when being wind blown.

Ich denke auch dass das von den Ventilatoren kommt, das sieht nämlich stark nach Windbrannd aus. Passe zuallererst die Ventilatoren an! Wenn Deine Pflanzen von Windbrand betroffen sind, stehen die Ventilatoren entweder zu nah, sind zu stark eingestellt oder beides. Stelle sie weiter weg und/oder reduziere die Windgeschwindigkeit. Eine leichte Brise ist ausreichend, um die Luftzirkulation aufrechtzuerhalten und junge Pflanzen zu stärken. Du musst keinen Wirbelsturm nachahmen! Beschneide Deine Pflanzen. Ein kleiner Schaden kann repariert werden, aber wenn er zu groß ist, wird dieser die Ressourcen Deiner Pflanze aufzehren. Es lohnt sich, stark beschädigte Blätter abzuschneiden, damit die Pflanze ihre Energie zu den noch gesunden Teilen lenkt, anstatt sie zu den beschädigten Blättern zu transportieren.

Looking at rusty medium - ph is main candidate. Fan can cause mechanical damage, but here goes in bubles, not verges ( which would remind potassium too ), so i would guess - ph imbalance.

only near the fan? if that fan is functional, it's a likely candidate to blame for damage shielded leaves at bottom don't stay picturesque forever, either.