Please help an old timer out!

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First, I have really enjoyed reading posts and grows on this site. This is a wonderful resource. Thanks to all of you who take time to share your knowledge. I am probably as old as most of your dads. Product of the sixties, Viet Nam era vet, served most of my time in Mons, Belgium (a quick drive from Amsterdam), and a lung cancer survivor. That's enough background.

I have had a couple of outside grows with limited success so I decided to start microgrowing to better control the elements. I have a 2x4x5 Apollo tent with a MarsHydro 144x5 Reflector. The tent is in an unconditioned space that is like a dug-out basement. I am exchanging the air twice an hour with outside air. I had to add a dehumidifier in an effort to keep the humidity around 65% - 75%. I live right at the 33rd lattitude in southeast USA so the humidity can be extreme. Before I added the humidifier, the RH was averaging between 80% - 85%.

I am currently growing four Nirvana OG Kush Autos. They are on day forty three. I am only here on extended weekends which has not been a problem so far. The plants have been the picture of health until this week. I noticed that a majority of the leaves (especially the newer) are cupping. (I will try to post photos). I would hate to know that I am doing something wrong this far into the grow.

The soil is 45% Foxfarm Frog, 45% Foxfarm Coco Loco, and 10% perlite.

I am using the Advanced Nutrients three part (Micro, Grow, and Bloom) along with their Sensi-Cal Mag Extra. The only other nutrient I am using is Re-Cycler by Hydro-ponics (a root conditioner).

The plants are in soft pots and roots are evident growing through the pots.

The normal PH can vary between 5.9 - 6.2.

I started the nutrients at 500ppm and have worked up to around 800ppm. I have used the nutrients in even doses at about half of the recommended.

The plants were showing their sex last week (I think), so hopefully, they should be going into flower soon.

Hopefully, you can see what I'm concerned about with this photo. If not, I will try to get a more detailed one.

Thanks for your response.

IMG_1327.JPG
 
I am on my phone and really do not see it. I do see on one fan leaf that it has some holes in it so I would worry if you have bugs..

How close are your lights it may be wheat issue.. What is the temp in your tent?
 
Ahh I see what's up. Some leaves are looking perfect, some are getting much lighter green away from the veins. I think it's a Magnesium deficiency, which is pretty easy to fix. That Sensi CalMag Xtra should have covered it, but occasionally autos especially under LEDs need more Cal and Mag. There is a foliar spray feeding dosage for the Sensi CalMag Xtra at 2ml / litre. Also, you could dilute a pinch of good old Epsom Salt (magnesium sulfate) into water and spray them. The cupping doesn't look so bad in the pic, it might be from temp or humidity.
 
I appreciate it Ripper and Anthropolis! I will give the spray a try. The heat is pretty constant where I am. It's hard to keep the temp below 80F.
Y'all amaze me with the cumulative knowledge on this board!
I have been checking out your perpetual grow Anthro. That's want I where I would like to get to.
 
Thanks haha, it's been slow this year so far in my garden, but this next upcoming round should be stellar. I understand about the heat, my tent is in such a place that it's just at the mercy of whatever temp nature decides it's going to be that day lol. So summers can hit 110F... but some seaweed powder / kelp meal plus a pinch of extra silica helps the plants handle the extreme heat.
 
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