Leaf curl getting worse after fixing PH and Flushing

Details of Grow

Soil - 30% Perelite / 50% FFOF / 10% Black Gold
Nutrient schedule - FFOF
Grow Area - 4x4x6.5
Lights - 2x Otdair 1500W 400 LEDs Grow Light @ 22 inches
Intake and Exhaust Fans
Temp/Humidity - 65(lights off)-78 with humidity 60% maintained and stable
Watering gallon every 3-4 days as needed.

Hi all! Love reading all the advice on this site. I wanted to present the problem my one girl is showing. About 2 weeks ago, she started showing some spotting and bad curl/canoeing. The tips of the leaves also started to brown and crumble. I posted elsewhere for advice and everyone told me it was a PH problem. I checked my pen and lo and behold, it was off by .8 (showing more alkaline). I bought a better pen and ensure its calibrated.

I flushed her with 5 gallons of tap water(6.5 and 150 PPM). When I started, runoff was 500 ppm and 5.8 PH. By the end, it was around 300 and PH was 6.1. On my last batch of water, I added 1 TSP of Grow Big and Big Bloom. In hindsight, I feel like this was a mistake. This was 4 days ago.

I checked her this morning, and it seems like some leaves are straightening, and some are curling much worse(full 180 back towards themselves). It also looks like the new growth on top is a lighter green than it was before. There are new tips being burnt, and it alternates between going up and down.

Is this still a PH issue I am dealing with? The claw is making me think nitrogen issues, but the plants aren't waxy. Appreciate any help or any additional questions I can answer. Thank you!

This is the state of the plant pre-flush. I also defoilated a bit after the flush so it may be a bit more beefy in the "pre" photos

They look over watered, try watering less, less often.

N toxicity?

Hollatchaboy said:

N toxicity?

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Would the curl get worse AFTER the flush then though? That's why I dont think it's that.

Those leaves are showing signs of you watering too much, when you over log your pots with water it presents several problems, from leaves curling like your pics and it also causes lockouts. You should water with less water and less often.

Are you sure your ph pen is calibrated correctly? This looks like a ph issue getting worse to me

This looks like an over watering issue to me, Ive had this problem before, easy to fix.. Water less

Playk328 said:

This looks like an over watering issue to me, Ive had this problem before, easy to fix.. Water less

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When you fixed it, did the leaves eventually straighten back out, or did you remove? It seems like some of the leaves that were previously curled are starting to straighten back out.

oill said:

Are you sure your ph pen is calibrated correctly? This looks like a ph issue getting worse to me

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After I calibrated and removed the spotted leaves, I don't really that issue coming back. I also have been checking with ph strips as well to double check, so I'd be surprised.

What size containers?

The damaged leaves dont fully recover, the new growth will. Ive over watered a few times since I started back in 2006. Just water less, let the soil get a bit dryer between watering. Plant roots need oxygen, if you are water logging your pots it is essentially suffocating them. Let the pots dry out more between watering and water with less volume.

N toxicity, and those leaves might start turning brown as mobile nutrients move upward

When adjusting the ph it would have brought any nutrients locked up around the root now in accessible range. You've then gone an added some more at high doses. You've probably locked them out thats why there probably pale on top. Flush them abit with ph'd water an then when it dries out a bit then start with watering with a low dose of nutrients. Your in flower, not sure what your strain is but it looks like it might have quite some sativa in it. Some sativas dont like high doses of feed in flower especially nitrogen. So you might need to lower your nitrogen as well as lower feed strength. So once you've flushed Slowly build the feed strength back up till you see very slightly tip burn then back it off slightly an you will then know what the plant can handle then keep it at that dose.

walkaj03 said:

When you fixed it, did the leaves eventually straighten back out, or did you remove? It seems like some of the leaves that were previously curled are starting to straighten back out.

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They won't straighten out. But that doesn't mean you should remove them.