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Leaves started to yellow? Early veg stage autoflower - first grow ever

Hey folks! As a first time grower I think I have faced some problems… so its start of week 3 in veg stage for my babies and I can already see the difference in grow when I compare both plants. They are same strain same genetics (sour diesel auto from fast buds - growing outdoor).
So I noticed that one plant (the one that doesnt grow that vigorously) is getting a little yellow on the edges of some leaves (nothing too much but still as 1st time I am worried a bit) - I did google it out and figured out there might be a nitrogen defficiency. I am feeding them every 3-4 days (2, 3 times a week at most) with reduced dose 1st week and 2nd week gradually increased but still not as much as feeding chart says. And I can see this plant is growing not as good as the other one. The other one has flora gard soil which already contain some of the nutes like N.
And the one that grows weaker had a light soil mix but I mixed it with this flora gard ar start because I didnt have enough light soil mix for full pot. The plant that is growing better has a dark spot on one leaf (looks like some oil) but I dont know how since i never ever used oil during that period. That doesnt concerne me as much because this plant is still doing well no matter. The other one with yellowing leaves concernes me more. Any help and suggestions would be highly appreciated! Good luck growing everyone! Cheers!
Posting pics below: (first 3 pics - weaker plant and last 3 pictures - healthy plant? Except for black spot)
 

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Yeah Im gradually increasing and I can tell they seem to be very happy after I feed them nutes!
Actually I didnt check on my pH since I am using hesi fertilizer and Ive heard from experienced users that hesi fertilzers actually balance pH and corrects it to like 7pH am I correct? Thats what Ive been told actually
 
Really, I dont see anything wrong besides a bunch of little spiccy specs on the "Who Cares" set of leaves. Since the plant is outdoors, you might see a bunch of weird shit on it. The most dangerous enemy of weed plants is humans who over-analyze the plant ;)
Good to hear that from experienced growers! Thank you anyways! Appreciated
 
Better it is a bit less than too much which causes more problems. And don't feed the slower growing plant too much now, the roots have to grow too and than your plant gets bigger. ;) So nothing to worry here, your plants both look very healthy. :)
Thanks man! I was actually about to increase nuts today. I increase a bit with every feeding. I’ll let you know how they react after feeding. Thank you btw everyone for your opinions and suggestions
 
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