Need some help and advise, whats going with this plant?

Lol I'm not running it's just after they say it needs more feeding I just did that I stopped checking the thread I only use this site when I have a question to ask growers world wide.........I had this same problem with previous grow and I thought my ppm was too high 1100 plus, so I dropped ppm to 200-400 for all while they are in veg. I do not give them different feeding for each plant...it's the same strain but I have 3 phenotypes, I'd say that is #1 for me...I stopped use the flora bloom feeding from gh...I use plagron along w other natural nutes I was using all the time....in couple weeks I'll give updates because yes I gave some bat guano and with light algra grow for nitrogen and then continued with alga bloom and its recovered when I thought it was done!!
Why did that one yellow and not the others? Same strain? Is it in the same medium? Same watering schedule? Or did you really just not feed this one for some reason and then wonder why it was yellowing? Im inclined to give you the benefit of the doubt and say that seems unlikely. So, just saying feed it might not be the simple answer if something like the ph is off in this one pot and there's lockout or something. Just sayin. Again, unless you actually just chronically underfed this one plant?
That's because the
Why did that one yellow and not the others? Same strain? Is it in the same medium? Same watering schedule? Or did you really just not feed this one for some reason and then wonder why it was yellowing? Im inclined to give you the benefit of the doubt and say that seems unlikely. So, just saying feed it might not be the simple answer if something like the ph is off in this one pot and there's lockout or something. Just sayin. Again, unless you actually just chronically underfed this one plant?
The one next to it with buds coming in have the same problem after, I had same problem previously and I thought it was high ppm 1100 so I lowered it to 200-400 for veg and kept them around the same for flowering...but everything is fixed or better now and will give updates....the thing is I never used to do ppm reading so it's new and I never had problems in flowering like this.
 
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