Fastbuds Gorilla Glue Not Thriving

[Archaic]

Both plants are getting 500 ppm of MegaCrop 1.0 under 3K lights. Consistent 30% humidity mid 70s temps.
The GG is on the left.

The Citrus Noir is doing very nicely, the GG looks like poop. The lower leaves are yellowing, the whole plant looks limey, starting to get red stems. Is she just hungry or am I missing something?

I also have been adding a bit of Mammoth P by hand to both plants since just before blooming.

The pH has been pretty consistent at around 6.5 in the reservoir. Help me nerds. I really want this girl to rock.

 

[Simplicio]

Humidity, temperature, and amount of fertilizer all affect plant growth.
Our plants can grow with any humidity, but they will be much happier and healthier with humidity in the 60s.
Get some ultrasonic, top fill humidifiers, and those plants will take off.

 

[Heavily Medicated]

Those plants are hungry. I use MegaCrop and would be up to around 750 - 800 ppm. Good to use the Mammoth P, MegaCrop seems to lack a little P and Ca during bloom. I add Big Bud when starting bloom and switch to Overdrive to finish up. I have some grows that have no Ca issues, and some grows that do. Plant genetics playing a role here, just monitor and have some Ca/Mg on hand. My ppm table looks like this, keep in mind this is just ranges. Seedling 300-600 ppm, Grow 600-900 ppm, and Bloom 900-1200. Every plant is different, an old school little autoflower might only a maximum of 600, where a large modern super autoflower can go over 1200. Just learn to read the plant and she will tell you how much to feed.

 

[Green Hornet]

After finishing 2 GG-4 grows I have found that mine craved calcium and Magnesium. I used a product called roots organics elemental. It is a powdered (1 tablespoon on top) Calcium and Magnesium supplement. This is the make up on the bag for substitution (N)=.25%, soluble potash.1%, Calcium 20%,magnesium 5%,sulfur 1%. I was growing in the roots original coco. During flower I gave them 3 times the dosage that was recommended and they looked fine. They were also fed super phosphate bat guano all through bloom. The GG looks hangry to me. Looks like you have a good set up and are in tune hope this helps. I would start small and gradually increase.

 

[Waira]

:smoking: Hey Archaic, odd to see you here!

MC can have it's issues, I know all too well from my own experience,... I'm with HM, overall it's a low ppm value, MC seems to not be as nutrient rich as the ppm/EC would indicate, and I strongly suspect that it's due to a big chunk of the ppm's going to the included Ca and Mg alone, and the other non- elemental nutients (Aminos, sugars etc.... some of these are neutral charge, won't register, but some aren't).... Also, I find MC to be generally too weak in P content... the Sweet Candy will cover your butt for K and S, so I'd start adding that as well.... BE is too heavy in K except, IMO, for a finishing fert', so look into finding something with fatter P content, lower in K since you have multiple sources of that going in, plenty!
Symptoms look like an early P defc., maybe S as well,... I can't quite tell in the pics, but if the tops are worse for fading, then S and/or P and/or other micro's are lacking, ones that are not mobile,.. P is, but it seems to get drawn from higher up leaves, unlike N and K,....
I have barked at GLN before about micronute content, and having no supplements for that,... EU folks (think you are one?) get burned there, so many times I try to recommend a micro' supp' to folks there, but can't find one worth a damn,... Stateside, Earth Juice Microbalst is hands down the best; broad coverage, no NPK, largely sulfate based, well chelated,.... I use this weekly regarless, prevention is fuckin-A better than cure with micro's defc's, which can be a bitch to fix!
Anyway, tinker with your ppm's some and see if it helps,... A foliar or two would be good as well, just make sure you use a wetting agent and spray the leaf bottoms as well (more stomata there vs. topside)..... this is the fastest most direct way into the plant! Dilute to about 300-400 ppm's....

 

[Archaic]

I think it's getting worse. I'm up from 500ppm to 1000ppm for about 4-5 days. The CN still looks good.

The lights don't show how bad it really is.

Bad leaf

I'm at a loss here. Fastbuds has always been great growing for me

 

[Archaic]

Bumpity

 

[Waira]

Did you add or balance in more Sweet Candy (for the S)?.... any additional P input beyond what MC offers?
I'm still thinking S defc. issue, but the necrosis and some of the other yellowing looks like P defc.,... Has this plant been kinda sickly all along? An inferior pheno' is a definite possibility...
What's the pH in-pot Archaic?... what the res' is doesn't reflect what's going on in the pot itself....
it bugs me that several days anf upp'ed ppm's have done nothing at all,... that hints that either the wrong specific nutes are not getting upp'ed, and/or the pH is locking them out,....