Why is one of her first leaves turning yellow? :sc...

I would of started feeding yesterday, if your are in biobizz light it has very little NPK. You need to feed every water with biobizz. You should already been using root juice if your using that.

Hello, this is most likely normal. The genetics of this particular may be weak. I have a C99 plant (7 weeks veg) growing outside, and it was from a three year old seed. ----> see my diary. It is slow growing, but the new leaves are a nice green. When the leaves get a few days old, they turn light green, and then shrivel a little, after more time. The next new leaves are always a good color. I just trim off the old leaves to keep her looking good. The jury is out, how she'll turn out. Since the soil is good/rich, and still new, I do not, and will not feed for any wierdness. At this point in its life, genetics will determine if she thrives or not. Let her grow out, and wait for at least 30 days, before you try and feed.

No don’t think it has I’m using biobizz light mix

Does your soil have added Nutrients? I use Fox Farm Ocean Forest and with that there's no need to feed for 3-4 weeks.

Sud I start with nutritions?? Or wait a bit?