Late flower diagnosing week 12 total week 7 in flower

Hey guys I'm back with some questions about my dwc garden....
1. Does anyone have a decent chart for diagnosing plant issues? I'll post pictures of what I discovered in the garden.

2. Does anyone ever notice an upswing in pH during flower? (specifically towards the end of flower - dwc only)

3. Also if anyone can help by sharing an example of their autoflower nutrient feeding that would be great! I plan on running some experiments with different nutrient lines to see what works for me. My only question is how strong should my solution be if water from the tap starts out at 200ppm?

I know she's almost ready for harvest but I just want some notes and tips for future grows. TIA for any help!

Looks like a magnesium deficiency. Where on the plant is this happening?

jfarrismu said:

Looks like a magnesium deficiency. Where on the plant is this happening?

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I plucked those 2 from the lower part of the canopy

GardenOfZorahn said:

I plucked those 2 from the lower part of the canopy

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Lower and older and yellow between veins --> magnesium deficiency

That's my bet at least

The upper leaves look a healthy green (not lime green), so I doubt it's nitrogen deficiency

Sorry for the comment spam, but is your pH good?

jfarrismu said:

Sorry for the comment spam, but is your pH good?

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Haha no worries I appreciate the help lol. My pH tends to swing up from 5.8 to 6.0 and sometimes up to 6.2 but for the most part the swings have been within range 5.5-6.5

GardenOfZorahn said:

Haha no worries I appreciate the help lol. My pH tends to swing up from 5.8 to 6.0 and sometimes up to 6.2 but for the most part the swings have been within range 5.5-6.5

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Not a pH problem impacting absorption, then. Yeah I would do some cal mag

jfarrismu said:

Not a pH problem impacting absorption, then. Yeah I would do some cal mag

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Thank you! I was beginning to wonder if it's just that lol I can't say the same for other plants haha those ones are much younger and showing the same symptoms and they're pH swings way too high for my liking. But that's why I'll be doing some experiments on the next run to really try n figure out what works best for my environment