I’m on my second run and I too am having issues with GG4. This thing was a beast and didn’t start to flower until 40 days in. All was good. Have been testing runoff all along. pH 6.8 and ppm 500-500. Growing in FFOF with 20% perlite. Last week too dresses with dr earth but the issue started affecting older larger leaves first then spread. Started with dropping leaves. I don’t over or under water so I’m pretty sure it’s not that. I did add some fox farm nutes once after the issue first started. It was just the big buds formula. This is the only plant out of 6 that did this. It’s also the biggest (not sure if that has any relevance)
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To me it looks like its pulling all the nutrition it can find from the oldest leaves.
A catastrophic root problem like rot would do it to every single leaf and not just the big ones.
Perhaps 500ppm is not enough for this girl.
pH lockout could do that but if runoff is 6.8 it sounds like that is not the problem.
Most try to keep ppms around 1000
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@Chinzilla420 my assumption as well 
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Most relevant part. Yep, agree with others. That’s a feed me scenario. Especially since the others were fine.
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Thank you all. Since I did just top dress with Dr. Earths bloom girl, I will hit it with another dose of the FF Beastie Bloomz nutes. I also just got CleanKelp by Bloom City will add that as well just to help the roots. Hopefully she stays going and growing as she’s only got 3-4wks, already at day 83 today.
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Fed her 1/2tsp per .5gaal of the Beastie Bloomz and 5ml of CleanKelp. Then trimmed as much dead stuff off her I could.
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Thing is that product contains 0 nitrogen.
Kelp has a little but not enough.
You need a more balanced main food and use the Beastie as a supplement for flowering.
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Yeah. Realized that just not sure what’s good to use this late in the game. Any recommendations
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GG can be a heavy eater and drinker.
If you are water and feeding them all the same and this is only one doing this, I’d increase the frequency for the GG.
I’d agree from first sight it looks under watered and hungry.
If you just need quick nitrogen then find a friend with a diesel truck and ask them for a small shot glass of DEF, “Diesel Exhaust Fluid (DEF) which is composed of 32.5 percent urea and 67.5 percent deionized water.” Urea is nitrogen so DEF is 32.5-0-0 it would balance that beastly bloom perfectly at 32.5-50-30 
This stuff is sold in ever place that sales diesel so easy to find fast if nutrients is not readily available…
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If using fox farms don’t you have the trio. If so give her some.
I mix mine like this. Using a regular clean shot glass. Pour 1 shot favorite liquor drink that then. In a bucket put 4 gallons water then 3 shots big bloom 1 and a 1/2 shots tiger bloom and 3/4 shot big grow. Then clean shot glass fill with favorite liquor again drink. Then stir bucket and feed until you get a minimum run off of a cup a pint is better.
That is a normal feeding. Once every three feedings I add 2 caps of cal mag and 2 teaspoons of trifecta micros. I would do the add in right away with yours.
There is more to it for me at different times I add molasses and epsom salt. But thats another story. Good luck dude.