First day of 3rd Week Fllowering Leaves curling down? PICS!

A little info on my grow so far
2 1000w lights
top feed drip with hydroton
Water for 30 mins every 4.5 hours when the lights are on Total 3 times during light hours

Nutes
FF big bloom
Dark energy (boost N a little bit cause they looked a little yellow)
phed to 5.2-5.8
ppm around 500-550


Alright plants have had the yellowing on the very outer tips I tried more N and Running a balanced NPK but nothing. But now my new growth is all green again loooking nice so i trimed most big fan leaves that were blocking bud sites last night and noticed the slight drooped and curl.

What could cause this?
Seems kinda dark green which leads me to a N toxicity. But where does the droop an curl come from?

What about the outer yellowing on the fan leaves what can I do to correct this?

Prolly got a lock out of something

it says top feed drip in hydroton...

Looks like a bit of overwatering not quite sure on the yellowing

Looks like a combination of previous mild nute burn i know there at 500-550ppms now but have they always been? and begging of heat stress. The downward curling on the leaves is called "claw" here is a example of a more series situation ( https://www.rollitup.org/marijuana-plant-problems/349788-why-do-my-plants-have.html ).

That is nitrogen toxicity..... flush baby flush and quickly.... that is half way up the leaves. Also your magnesium is too low.... something about this is all wrong.... especially with ppm of 550 in that PH range... I just saw it, you torched the tips with that N booster and have a toxicity problem. That in turn has caused a Ca problem which may or has led to Mg problem.... You need to flush those out and change up the reservoirs.... look for root damage.. if you see it, slowly up the nutes to about 800-1200, depending on what the plant wants....

Quick recap, ppms were too low, you saw yellowing and hit it with N boost which caused a N toxicity. That led to the other problems you are seeing.

Serapis said:

That is nitrogen toxicity..... flush baby flush and quickly.... that is half way up the leaves. Also your magnesium is too low.... something about this is all wrong.... especially with ppm of 550 in that PH range... I just saw it, you torched the tips with that N booster and have a toxicity problem. That in turn has caused a Ca problem which may or has led to Mg problem.... You need to flush those out and change up the reservoirs.... look for root damage.. if you see it, slowly up the nutes to about 800-1200, depending on what the plant wants....

Quick recap, ppms were too low, you saw yellowing and hit it with N boost which caused a N toxicity. That led to the other problems you are seeing.

Click to expand...

flush them with straight ph'ed water? and for how long?

and they were alwways at around 350-550 ppm never more. Once when i first started i burned them when it spiked at 800ppm but that was like 3 weeks into veg.
idk how a 550ppm could give N toxicity. but thats what i was leaning towards