I think I have a male. Heat stress. Veg @ 4 weeks

update: OK so the temps have improved a lot. I think I have a magnesium deficiency, but I have no idea. I need to try something quickly as I should have taken care of it at the first sign.
The 2 larger plants are the headband regular seeds - the auto in flowering is an Afghan Kush Ryder and the 2 little ones are a Critical Kush fem and Cotton Candy fem.

Any feedback is much appreciated. I really want to correct any problems before I start flowering.

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That's a pH or a lockout issue my brethren.
Thanks for your input. I don't have a pH tester and I haven't been feeding with anything besides filtered water or spring water.
I've been to several stores like 5 times trying to find something to use to mix in the water for feeding, but it's all miracle grow...

Any advice??
 
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This is one of the Headbands that I think might be a male, anyways I took some closeups of different issues.
You can see the heat stress (this has been corrected) on one area.

Question: Should I feed him/her with spring water or filtered water (don't know the pH) or should I go to this local nursery tomorrow (I haven't been here yet, but it looks good) and get something to add to my water?

I should be able to order a cheap pH tester from Amazon unless someone can suggest something else?

Thanks in advance for everyone's help. This looks bad compared to my first grow. I didn't have any of these issues.

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