Questions on first grow. Mutations and possible nutrient or pH issues.

Hey everyone.
I'm new to the threads and have been reading in the dark up until now.

This grow is my first legitimate one and it's going fairly well, to which I am happy and excited, but I have read countless hours on the subject of growing now and have endless questions it seems.

However, this thread relates to some bag seeds I popped and to a sativa fem seeds that was purchased and is looking a bit sad.
Overall everything is looking quite tasty at about 5-6 weeks into flower, but a few are a bit funny looking. One especially in the leaf margin spacing and leaf structure.. the possible mutation.

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Some background:
I have 5 of these bag seed plants, all of which thankfully ended up being female, which was a nice score.
But one of the 5 phenos is showing this very odd leaf structure.. some kind of genetic mutation??

All plants have been grown organic in living-ish soil.


In regards to the sativa fem, she has been displaying yellowing leaves on the entire plant, rather uniformly, and has leaves curling downwards, also quite uniformly over the entire plant.
However out of 7 plants she's the only one displaying this stress, so it leads me to believe the variety is picky or something of the like.
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Thank you in advance to any comments.. I have learned quite a bit from the community and appreciate it greatly.
 
This strain was said to need a bit extra magnesium and calcium.. hmm. It's animal cookies s1, by Greenpoint.

I also just learned about pHing the water to water I give the girls, last week.. so being I live in southern AZ with typical tap pH around 7.7-8, maybe 7.5 after it goes through my basic carbon filter, that could be the source of all my issues?

I know it's not a lack of nutrients in the soil.
The only real culprit could be pH it seems so far, or perhaps a bit of nitrogen or sulfur deficient? It started yellow down low and worked it way up.
 
But it is also the only plant in the group that yellowed. The rest (all smaller indicas) are a nicer green with the worst being some burnt tips and this bit here on one of them.

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The leaves curling into claws on every plant though so I figure that's either over watering or a pH imbalance, as well.

I let them go a bit longer between waterings this time to test that theory some, but they didn't perk up much.
 
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