

Differenze between plants
Hello everyone, I am new to growing plants and I currently have four plants, three are healthy and fast growing like the one on the second picture but the one on the first picture seems to struggle, leaves colour is uneaven and also the leaves texture is not smooth like the others apart of the fact that is not growing as fast as the other ones.
Can someone help me understand what is happening and if I can do something to help the plant.
The temperature if the box is about 23° with 40% humidity. The plans are auto flowering and were panted about 10 days ago. Current illuminating them 20 hours a day.
Thank you in advance for your help.