Do you see the problem in these leaves?

Coco soil, 140W cree led , 18/6, and unknown nutrients,

These nutrients were given to me by my friends, but now I can't contact him. Maybe I don't use enough, the plants grow very slowly, the branches are many but small, and the plants are very short.

I have asked questions about worms, water problems, temperature problems.
Then I solved the temperature problem, using bottled water to let the air circulate. Next I will know the unknown worm in the soil, not sure if it is harmful.

All in all, I want to ask you guys, can you see any problems from these leaves, their actual color is between yellow and green, a bit yellowish

For me usually when I see leaves showing variation in leaf color with a slight what seems blueing effect in the outward veins in the leaf it points to a pH issue, the water the plant is being fed is to acidic. And the more acidic the water is will result in more color variations in the plants leaves. So in your case, it really isn't that bad, but it is still telling me that you have to make sure whatever water / feed you give them is in the pH 6.2 to 6.6 range to clear up that problem. And as a side note... most mediums, soil / soilless based, usually have buffers in them to keep the pH in the right range for most plants to grow without problems, but if you water / feed a plant with way to acidic water / feed mix, even those pH buffers that are in the medium can't raise the pH level high enough so even slight issues like you are experiencing can still happen!