On my second grow. This time its Kush and ancestral skunk. The Kush is showing some signs of a problem on the early leaves. I am trying to use various excess/deficiency charts to figure out but it seems like one that the pros can call out fairly easily. I imagine you might want to know more about the setup and what it gets for food. So far mostly PH balanced water, and one time the smallest amount of sensi grow nutrients i could measure. The light was a mars hydro ts1000 but I needed that one for a larger tent and switched these baby veggers to a Phlizon Linear Series PH-1000 that I got incredibly cheap. This is the only Kush that survived gemination but the 3 ancestral skunks have had the same treatment and I am not seeing this on them. Soil is āRoots Organics Originalā.
Explain this further please.
Looks to me like you have a Nitrogen and Magnesium deficiency going onā¦Iād bump up the nutrient strength a bit!
Roots Organic is a good soil and I use as a base to my super soil recipeā¦the soil āshouldā have enough nutrients to sustain the plant until flowerā¦
Have you done a run-off test to check pH and ppm coming out of soil?
EDIT: For Roots soil Iād run a pH of 6.5ā¦so slightly less than neutral.
Agree with Alaska - I see mag def, possibly calcium def, and might be a little light on nitrogen. Doesnāt look like itās due to lockout, I think youāre just a little light on nutes 
Could be on upper leaves, but this one points me to thrips ā¦ 
I used Roots organic in my first grow and didnāt add any nutrients until many many weeks in. This time I went with 1ml each of part A and Part B per liter of water. But most of the time I am just using water with a PH of 6.5. I should mention that I was told my PH meter might be crap and so i have been using test solution and using the colorchart to get as close to 6.5 as I can.
I have not done a run off test yet. I have never watered these enough to to get run off. They havenāt been in these larger pots very long. Maybe I am a noob and should be soaking the soil more when I transplant?
when watering with tap water I use ph down to get it to 6.5. Used sensi grow 1ml each of part A and Part B per liter of water for 1 or 2 waterings.
Dammit, I hope not. I got a rooted clone from a friend who had thrips but he washed it well and said he hadnāt seen any thrips for 2 weeks before bringing it to me. It is in the same tent. I constantly look under leaves for thrips but maybe I am missing them. If I have thrips this will be my first pest problem and I have plants flowering in a different tent in the same room. ugh.
The thrip damage on his plants didnāt look like that first photo at all, but it did look like that second photo.
Everything sounds good at this point!
I always thoroughly moisten soil before useā¦this Sunshine Advanced with coco Iāve been using has a horrible time soaking in water and evenly distributing it throughoutā¦I have to use hands and make sure itās completely wet and no dry spotsā¦
EDIT: You mention tap waterā¦is this city water or from a well?
If from a city water (treated) source it needs to sit out for 24 hrs before use to allow chlorine, fluoride, and other nasty chemicals to evaporateā¦
Also it doesnāt look like Thrips to meā¦no black dot shit spots!
I just did a quick google on your soil.
It seems to have a fair amount of food in it but potentially low pH.
Check your runoff.
Treated city water. I leave it out for at least 24 hours in a wide topped container. Then I test PH, add PH down, test again. When adding nutrients I add them before testing PH. I have never needed to PH down after adding nutrients. The sensi grow seems to get it to the correct PH (around 6.5) on its own.
You seem to be doing everything right to meā¦Iād definitely do the run-off test see whatās going on with the soil!
Hope you wonāt have them, it was the irregular pattern of the spots that make me think about them:
and just happening in single leaves, not the whole plant or the rest, my second guess would be pH fluctuations ā¦ 
I do agree with the ph issues
But I firmly believe everything starts with ph
If ph is off it leads to all sorts of issues
Paps
What is your Tap water PPM or EC? ive gotten similar calcium def, but PH might be a good place to start.
Totally forgot until nowā¦
But VPD is very important!! If out of spec the plant has a tough time moving calcium throughout the plant and could easily be causing the calcium ādeficiencyā spots!
Oooo buddy! Here comes the boron deficiency detection specialist to shut you down!
I only see one antagonizing thing here
Looks like boron.