Black/redish spots on leaves

Thank you for all the answers, the reason I think this is a fungi infection is because there is a high humidity (up to 80%) during night lately and my dumb-dumb brain forgot micronutrient deficiencies also exists to check. I ordered soil meter via online and check the pH of soil as soon as it arrived.

Looks like a simple calcium deficiency to me, not a disease of any sort.

The one piece of critical information is missing from your diary - your pH... I think this is the start of a calcium deficiency but WHY you're getting this is going to inform you on how to treat it - and throwing calmag at it is usually not the answer. If your pH is not in a good spot (6.0-6.5), no matter how much calcium you give her, the plant will not be able to absorb it... so first of all, check the pH! She's also looking quite pale so I would increase the NPK nutes you're providing her... being careful not to overload with nitrogen as an excess of THAT nute will cause a lockout as well.... Good luck!

salut, soit un problème de ph ou alors peut-être une eau calcaire si tu arrose à l'eau du robinet. Ou les deux.

Roberts right✌️ my advice Is to check pH in & out , probably It Is wrong :) and keep attention to not excess Nitrogen, It cause lack of absorption of P K :)

This is either potassium related or cal mag related. You should not of cut leaves away till problem fixed. Now it will suck nutrition from healthy leaves. Causing more leaf loss. I would increase those 3 nutes. Good luck and happy Growing. 🌱