They look excellent, but yes I'm familiar with those spots coming anyway...Well dejavu again....getting spotting on the big fan leaves of my biggest/oldest girl. Growing in FFOF and just gave MC (1g) the last two feedings, around day 30 old. What gives???
Lux says 31k-33k, 16" height at 75 %
@Justin Goody yours looked like this when you have some cal mag?
Even a smaller one, still on just FFOF, no MC, 25 days old is also starting
Perhaps I've waited too long for some MC?
Full tent shot
#1 thing, I'm usually feeding 3-4g/G by this stage, so possibly upping their dose will eliminate the problem.
I also haven't noticed that issue since I switched to promix/perlite 80/20.
And just an outside chance, but the wood chips yu have in there could be making your waterings slightly more acidic than desired, messing with pH a bit. That's likely not it, but just crossing off some possibilities.
@Mr. Sauga is really good at diagnosing early leaf problems, he has helped me immensely. Hoping he can jump in before the problem becomes a problem.