Looks like a magnesium overload. Happened to me when I added lime to the soil and added cal mag. That one leaf is no big deal. Could have made contact with the soil at some point. The second pic up there looks just like the one I had that had a magnesium overload.
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My bad. They do show a curve in vpd charts. But it’s not a “C”… it’s an “S”.
Only proof of this I have is my current pile of neglect that looks like a good grow. I have my hygro records tho.
Bahaha. Now I don’t even have that monitors record to show… Battery must’ve died and I never downloaded it…
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This what I was going to say.
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@Budz Thanks pal. I am aware of FFHF having issues. My last grow had low Ph from the start, so this grow I added a small amount of lime. I got the same thing again, low Ph. It’s the same FFHF batch I purchased. So I tried to minimize the Ph problem from before.
I think this might be my last time with FFHF.
I was going by the schedule that has been posted here multiple times regarding my Rh.
This is the first time I’m saying this is too high for the temps. Hmmm?
I can easily lower it. But then I’d be out of range on the Rh sched? Thanks, I’ll take a read. @Budz
@BobbyDigital Magnesium? Hmmm? I didn’t find that by looking at the disease pics, lol. Thanks
I added the lime because I think I have bad FFHF. The Ph runoff has been very low. Didn’t help I guess.
The second plant has looked different since it popped. I was just thinking genetics.
Looks like I’m going to need a new soil mix next time. Thanks I’ll keep an eye on this.
@Covertgrower I was going with this theory too. I haven’t done anything to the plant but add water, lol.
Thanks for the input. I appreciate it.
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Anytime @TommyD
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Yeah to close to the soil to take seriously.
I agree with others
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Looks good to me.
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@Covertgrower So far so good.
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Watered #3 today 2.5 liters each. I can’t shake the low runoff Ph. But with the plants growing ok I’m motoring on.
Water in 65.4 PPM 336 Added 1.75 ml of nutes per gallon of calmag, micro, gro and bloom.
P1 runoff 52.2 Ph 733 PPM
P2 runoff 49.5 Ph 984 PPM.
I have the SF4000 up to 70% finally.
@yoshi Here’s my grow.
yeah ? 
I’m keeping an eye on them @yoshi. The plant on the left never had normal leaves, it looked funny from the start.
I just got the LED to 70% the other day. Things started to change on the plants at that point.
I watched the leaves change some at that point and the tips got a little yellow. I was at 36 inches too.
I looked at the your post and I can’t tell yet?
@yoshi I better figure this out. My next watering has nutes. Or I had planned to add them.
You don’t noticed the color difference in them cause they may been having issues in ph and ppm swings since the beginning if the soil is hot 
? Which type of medium you using and what’s all in it ? Before you do anything I may suggest , check with the moderators grow pros before you do what I might suggest , which you still don’t really have to listen to me honestly, I’m no expert but I can grow the hell out of some plants at least 8 or 9 different ways since I’ve been doing this and still learning so I’m no grow pro just so you know !
How old is the plant 
totally ? This might help as well but I’m not sure of where you at totally ?
Again it might help ?
Never try to match the runoff ppm from the soil that you pour in as watering is a big headache waiting to happen within 2 weeks!
I try to follow the chart as my plain ph water I pour in and my feed nutrients I’d a bit more aggressive from what or how the plants is growing from what I see . But I would not suggest you go into flower yet until you get the ph numbers consistent going in and coming out within 3 tenths to the buffered number , so if you pour in 6.5 and it comes out 6.2 call it good 
, If you pour in 6.2 and it comes out 5.9 call it good and the 6.2 is the start for vegging and the 6.5 is for flowering ! But if your ph is to low they will not used bloom nutrients at a low ph , it has to be 6.0 are higher before phosphorus and magnesium and potassium and calcium can be used by the roots for blooming , if it’s acidic and below 5.8 than it will only used more nitrogen and iron to grow foliage !
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@yoshi I have been using Fox Farm Happy Frog. It’s hot, but the general thinking was that after a month or at the 3rd feeding it has worn out the initial soil nutrients. I went with that. I was following a schedule that I found here concerning PPMS and mine were high using just water, that is a fact. With just water and FFHF I was in the 1100-1200 range at first. I couldn’t do anything about that? And I had low Ph.
The plants are about 4 weeks old.
The nutrients in the soil have waned. I was between 700-900 last watering.
I’ll be watering in a few days.
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