Garage Grow No.1

From the variety of different shapes the white markings are, you're probably dealing with thrips - but you don't need to figure out precisely what they are because there are treatments that will get rid of both thrips or spider mites. As m0use says, it's easy to find something that will help you and it really doesn't matter what that is either since you are in veg and anything can be used... but if I were you, I would choose something that can be used all the way to harvest just in case you get rid of them now and they come back later during flowering... so my recommendation to you is to get some Spinosad or Dr. Zymes Eliminator.. both are organic and both will kill thrips, spider mites, aphids, whiteflies... any sucking insect. BT is used for chewing bugs - catepillars and the like (which is NOT the problem here but I offer that just in case you ever find holes in your leaves!). Spinosad products, in particular, are going to be the most effective and easiest to find... you can get it at any garden center or online...

Good luck - it's a minor problem right now - but one that can explode overnight.

Yeah, it's probably just the genetics of that particular seed.... I've got 3 plants going where 2 are "normal" size and the 3rd is 5-6" taller and always has been - opposite problem from yours but the same idea.... Your lights, obviously, are a good distance away so if she wasn't getting enough, she'd be stretching... so THAT'S not the problem. The only thing I can think of to suggest (other than just accepting her as she is) might be to add some Recharge into her feed and see if stimulating her roots would help her out. This has done wonders for some problem-children of mine at various stages and just might help yours as well. If she doesn't respond to that, I think you're going to just have to accept her!

Good luck!

If you have moved it from indoors to outside into direct sunlight, without "hardening off" first, this is the result, burnt tips.
Sunlight is much stronger than lamp light and any plant growing indoors needs to grow accustomed (harden off) to sunlight once moved outdoors by only getting morning sun, then shade for the middle part of the day, gradually increasing the amount of sun over a week or two, before it can handle all day sunlight.

One of the best articles on this can be found here: https://www.growweedeasy.com/nebulas-super-simple-3-step-defoliation-tutorial

You really DO need to do some defoliation to get air flow going as well as bringing light to the lower bud sites... that article will help you figure out what to trim, when to trim and how much to trim .... it's my go-to reference for defoliation!

Good luck!

Honestly just fix the ph first. The problem may sort itself out rather easily. I would not add anything until after the ph is corrected depending on your grow media. The optimal ph for cannabis is 5.5-6.5, the lower end geared towards hydroponics and the higher end towards soil.