Constantin94 At the beginning of the week, I started thinking they were growing too slowly and didn’t look very healthy, so I realized I was making a huge mistake.
The tap water where I live is full of limescale, and I was also using the same water for the humidifier. A few days later, the cloth filter protecting the extractor was covered with a white layer of mineral residue.
I was controlling the pH and PPM, but I hadn’t considered all the other substances the water might contain.
So I started watering them with purified drinking water (about USD for 25L where I live), and now they are starting to look better.