As the others said it’s probably a ph issue. But it looks that the problem is about calcium it can’t uptake it so you get a deficiency. So probably your calcium and magnesium volume is very low so try to look over your ph, and correct the ph in the medium by watering and watering and watering until the ph that runs out the pot is in the right range
5.5-6,5 in coco and 6-7 ph in soil. Ur run off has to be something in between these rates to be a healthy plant! If it’s not in these rates your plant won’t be able to drink the nutes that’s in ur medium. It just drink the water and evaporate it trough the leaves and ur humidity RISE A LOT! so to keep a good environment you need to keep the plants healthy and in the right ph range.
Good luck sorry for so much information I hope you know what I mean. If you don’t just DM and I’ll try to explain more deeply 😊 good luck my friend