I guess we can safely rule out those spots being from a spill.Rapidly growing at this point but still having problems with random dead spots forming.
that's what it looks like to me...cal-mag defI believe those spots on the tips of newest growth was a calmag issue. The stopped spreading and hasn't got any bigger. Don't know about the bottom part tho. I just hope it stops spreading
Calmag won't burn my leaves like other nutes? By the way, I have another plant that is a lot smaller due to late transplanting but it looks good, minor nute burn but healthy other than that. I got carried away with nutes last week. Learned my lesson there. Excited for my next grkw, think I can get that one closer to perfect!! Just hope I get a yield off this one. I'm waiting on the smoke. Recently moved to this town for work and my plants are my only sourceI beleive calcium deficiency shows signs in new growth. So assuming the new growth tips was that is a good call imo.
Mag on the other hand shows signs on older growth.
I recommend looking into a foilar spray of some diluted cal/mag before lights go out.
I have never done it but seen to remember reading that this is the quickest remedy.
Maybe consider giving cal/mag every feed. Because you aren't using tap water you aren't getting the benifit of the elements in it. I'm not saying to use tap water, just pointing out what could be the issue here.
Anyway, look into foilar spray. I hope it helps. Otherwise, she looks awesome!
Peace