While searching information in internet, I realized the plant had an actual deficiency in calcium and magnesium, that was the reason of the first yellow leaves. With a little of Cal Max and Bio heaven everything got cool, very grean leaves and also cutted the almost dead yellow leaves so the light could penetrate better. If you zoom, you can see that I tried to open the arms of the plants also for the light to penetrate better. This was the last week I used Bio heaven😉