Which deficiencie?

[Cringer]

Leaves are overlapping a little, ususlaly means she is a little too close to the light as well, but the color looks good now bud.

I turn 1 cob light off so only 1 cob light 55 watt total. To me she looks better from the coluor but very small for her age on Day 24 :-(

 

[MedCzech]

Yes, she is small, because the lights are too close and she can not stretch up to the light. Raise the light also. A 55w cob should be like 1 meter minimum from plant in first two or three weeks. That's like 39". Then if you do that, she will start to grow upwards for sure. Trust me.

She will be fine, but she needs less light.