I'd have to strongly disagree with my fellow growers
This is typical calmag.
If it were K, I'd be seeing edges crispy and so on. Not on this.
Also with the mag signs. Its just a typical calmag pal.
As you're still in veg. I don't see it been K at this stage. If it were I'd of seen it coming up. I can see light mag on the week before
You can add Epsom salt Foliar spray. Or an organic calmag r just feed it into sub.
Good Growing