Mango Haze Inbred x AC Haze - Indoor “Organic” Coco LED Grow

To me it looks like a manganese deficiency. In the late stage. Going by the dark spots. They don’t look like fungal lesions or septoria.
So to me manganese. This could have happened from being too high in minerals especially iron and it shuts out absorption of manganese.
I can’t remember what you were using for your soil or nutrients but if it’s only one pot I’d say it’s something in that one pot or maybe you got heavy handed with nutrients/minerals on that one pot once in the past? The mangoes can be very temperamental believe me! And some will take almost no nutrients compared to most other plants.
An iron deficiency can look similar but tends to have more yellowing on the leaves. Iron deficiency can also be caused by too high in manganese.
Make sure your ph is sufficient for your media and make sure the nutrients are balanced maybe use chelated manganese for better absorption or you can use a foliar spray to speed up uptake. I’m not sure that it’s too drastic at the moment without looking at the plant and in comparison to the others maybe more photos would help. I think just keep up what you are doing see if it is getting worse and maybe drop back to just water for a few feeds.
Hope this helps plants look great.
 
You guys are the best, thank you all for the input! Anyone else reading feel free to share your two cents you won’t hurt my feelings! I do remember having a similar issue (if not the exact same problem) I believe with my Mango Haze grow last time.. where it’s rusting / discolouring like between the veins of the leaf ( I’m not sure if I’m describing that accurately or not...). I’ll review my old mango grow thread and see if there are any hints or solutions and certainly keep all of your suggestions in mind and try to implement them over the coming days!!
 
My lazy arse finally got a light set up in the basement after noticing a single pollen sac had opened on one of the males.
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Hopefully not too much pollen has blown its way onto the females cause I was planning on only pollinating lower branches. One thing you won’t see me doing is complaining about having too many F1 seeds (Or would mine be F2 seeds? I forget how that works) of this legendary cross! So we’ll see what happens in a couple months!

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I cannot get enough of this pheno that I mentioned felt plush, smelled great, loved the structure and was pumping out three bud site's at each node! Really hope her high is enjoyable 🤞
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Day 29 of flower. 9 plants in a 2x4 tent, but with the reflective doors being kept open
as shown the footprint being taken up is really closer to a 4x4.
 
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