Looking great! Plants look happy. I had similar spots as you on one leaf in my current grow. I thought it might be calcium def in my case so I added in some cal-mag but it never spread beyond the one leaf. I don't think the cal-mag had much to do with it as it still got a little worse after adding cal-mag it just never spread. I've seen it on previous grows as well, a leaf here and there with brown spots but I haven't completely figured out the root cause. It doesn't seem to slow the plant down, fortunately.
Do you feed them full strength nutes every watering? I don't think my plants could take that. I usually stick around 60-80% of full strength. I feed them 2.5l every 3 days.
Couldn't you find any more phallic looking bottles for your cologne? Not sure if I'm manly enough to sport a dildo shaped cologne named hardon![]()
Cheers dude! I'm coming to the conclusion that this time round, it probably was a cal or mag def. Makes zero sense as my soil is quality and the water I use is natural mineral water with PH 6.2 so I shouldn't have a def at all

Yeah I tend to be rather merciless when it comes to nutes
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And dude, Hardon cologne is all about being a man! It's made from the ballbag sweat of UFC fighters and the saliva of lumberjacks with various other deposits from other 'real men'. You slap on some Hardon and you transform into a chick fuckin, wood choppin, jaw breakin hunk of awesomeness!
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Cheers,
Hardon