Curling, Yellow, Crispy, Sad Looking Leaves

Hello! My older fan leaves are starting to curl up, get a yellow discoloration, and become crispy . This is also starting to happen at the tips of newer fan leaves. Any help would be greatly appreciated!

Below is a picture of a couple of the leaves that are in the worst shape, which I just took off the plant. And a picture of the plant itself. I apologize for the quality of the actual plant, taking a picture under LED lighting doesn’t work out very well.


The deets…
Afghan strain (but this is happening to my other mystery indica strain as well).
This is a clone, cut 42 days ago, and has just started (rapidly) growing due to being under more intense light for the last 17 days.
19/5 vegetative light cycle
Hydroponic system
RO water
Using all nutrients that are recommended as a part of Flora Series Simple Drain To Waste
Using a CalMag supplement because of the RO water
Also adding a tad of hydrogen peroxide during each res change
I change the water every 7-10 days
PPM ranges between 700 and 800, it raises about 10 ppm a day though, and I add fresh water every now and then to get it back below 800. With it rising on its own, could this be a sign that it is getting too many nutes?
Temp range has been a little higher than I’d like recently, maxing out at 87°F during lights on (heat stress?), and around 77°F during lights off.
PH stays consistent, ranging from 5.8 to 6.2.
I have a Hot Shot No-Pest strip in there to keep bugs away.

Here are the GH nutes that I typically use for a res change, with 4.25 gallons of water:
FloraGro: 16 ml
FloraMicro: 16 ml
FloraBloom: 8 ml
RapidStart: 8 ml
Floralicious Plus: 3.25 ml
CALiMAGic: 21.25 ml
Hydrogen Peroxide: 17 ml
749 PPM

At this point I have no idea whether they are deficient in something, like Nitrogen maybe, have heat stress, nute burn, or something else.
Thanks for any suggestions

My opinion, you're over feeding your plant with all those extra additives. Use just the gro,micro,and bloom and forget the other stuff for now and see what happens. I personally nver use any of those additives for my plants and have good sccess....just my opinion.

I'm not hydro but I'd stop bloom nutes and cut back for abit.

mg lock-out perhaps. yellow, curling necrotic leaves. go to a simple feed schedule and lose the micro-nutes as suggested.

scrog is on the money. i would flush with florakleen if you have it or just plain ph'd water if you dont.
then i would drop ppm to 600. i dont ever feed calimagic unless i actually see a deficiency as too much will cause a lockout

Thank you for your suggestions, this looks like nute burn/lockout then. I will cut back on the additives and drop the ppm a bit.

My plants were showing a CalMag deficiency before the CALiMAGic, so I will continue it, but lower the ratio.

dont forget to flush. very important