Great news!
Thanks a lot for the comments on the last week, the plant was stuck and wilting the lower leaves. The light was too close, since I cannot dim it I just raised the light 10cm. Also the pot was too small, the roots was thin and circling the bottom of the cup.
For the transplant I used a custom made organic soil from recycled soil I had, added the organic fertilizer and let cooking for three weeks, tilting the soil two time during this period.
The pot is a 7L plastic pot, much used for gardening, with a lot of holes on the bottom.
I added some blood meal on the bottom of the pot, to boost the nitrogen levels of the soil and to be available for the plant when the roots reaches the area.
After the transplant I watered with 1L of dechlorinated water to really wet the soil, after that I just watered this morning with 0.7L (one week later). I’ll keep the watering low, and try to achieve zero runoff.
The plant is vigorously growing, the stem is getting thicker and the top leaves have a beautiful green color.