Is this some kind of deficiency?

[Rafalauro]

Growlog link: Original Auto Northern Lights

Just noticed some dark green in the inside part of some olders leafs. What does it means?

I’m not using any nutrients, just a pre fertilized soil.

[Blazedpug]

Looks good to me

[Icirazy22]

Are you feeding her yet? If not I would start now

[Rafalauro]

I will probably do that!

[Demonrage75]

A lot of issues start with the pH. Make sure you’re feeding and watering at the correct pH. If your pH is off it doesn’t matter how many nutrients you give it it can’t absorb them. You’re at the point where you should start feeding them.

[Rafalauro]

Thanks for your help!