Please help me save this plant and finish my first ever grow

The whole plant has had it's leaf tips burnt during almost it's whole growth and a few yellow leaves but nothing too bad. Few days ago I noticed it started to get more yellow leaves and more burnt leaves tips on the top leaves as well. The only change really is I started watering it 2 times a day a week ago. I water it with 1 liter in 5 gal pot and get 20/30 % runoff. I read you can't overwater in coco/perlite, but I'm also getting a bit more runoff than 10-20%. I also upped the PH to 6-6.2 from 5.8.
To me it looks like it needs another month of flowering so I don't think the yellowing leaves are natural as well as I haven't flushed, but I am using a quarter of the feed only.

Auto flower. 81 days old. Around 50 days of flowering.
Growing in 70/30 coco/perlite with the Biobizz nutrients except for calmag by Terra Aquatica since I couldn't find the calmag from Biobizz. Following schedule at 1/4 or 2/4 dose at 6/6.2 ph at flowering, 5.8-6.0 during veg. Changed it back to 5.8 after getting an advice to lower the PH. Don't have TDS meter.

SETUP:
Spiderfarmer SP-2000 at around 6500 lux.
3 smaller fans
Exhaust fan with carbon filter and SpiderFarmer tent 2x4 that went with the kit.
Temperature around 73-80 during day and 67 during night. Humidity around 45-60.

I'll let someone with Coco experience deal with the deficiency issue as I'm not well educated in it but why are you running 6500K lux? That's what I give my one day old seedlings and clones. In flower you should be around 35-50K depending on what the plant will tolerate. I'm thinking your reading is off but I don't know how you're measuring it. I'd try to tighten up that humidity range a little if you can to 50% or lower just to head off any potential mold or bud rot possibilities. If that's not possible, try not to have such a big swing in the lights on/off cycle with it and just keep an eye on them. Hopefully a Coco grower can answer the deficiency problem I'm guessing you have.

33 cm distance from light to the peak of the tallest bud. (not very even canopy sadly)/.
It's actually 6500x10
Is that too much ?

Oh shit! Yeah, that's close to 1200 umols depending on the spectrum they used for the light. You want 800-950 roughly. Are you sure you can trust the light meter?

Here's a site that converts lux to ppfd. Just enter the light spectrum from the manufacturer, usually 3000-4200 range. Read up on Max ppfd without CO2 to get an idea of where you want to be. I'd cut that light down a little if it has a dimmer or raise it up if possible. Are you getting tacoing of the upper leaves?

FirstCavApache64 said:

Oh shit! Yeah, that's close to 1200 umols depending on the spectrum they used for the light. You want 800-950 roughly. Are you sure you can trust the light meter?

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It's a cheap one from Aliexpress so no I don't really trust it.
Spiderfarmer says 30-45 cm during flowering.

FirstCavApache64 said:

Here's a site that converts lux to ppfd. Just enter the light spectrum from the manufacturer, usually 3000-4200 range. Read up on Max ppfd without CO2 to get an idea of where you want to be. I'd cut that light down a little if it has a dimmer or raise it up if possible. Are you getting tacoing of the upper leaves?

Convert Lux to PPFD - Online Calculator | Waveform Lighting

Online calculator to convert illuminance (lux) to PPFD (micromoles per second per meter squared).

www.waveformlighting.com

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I believe I am getting tacoing from the leaves. But I think I've noticed them everywhere not just the top leaves. Here's a picture.

It doesn't show bleaching so it's not really bad but looking at the picture on my crappy cell phone it sure looks like light stress is a contributing factor to what's going on. High light levels like high feed and warm temps in the 80s. It could be that the light stress has brought on the deficiency you're seeing. Coco is fairly different in how you water and is much more like hydro than soil. I use soil and dry amendments so as to the best fix for the deficiency I'm kinda at a loss. I'd for sure cut that light down by 20% for now and hopefully someone with a good background in Coco can help you out. Coco for Cannabis is supposed to be a good reference forum for that specific media, I'd give it a look if you have time.

FirstCavApache64 said:

It doesn't show bleaching so it's not really bad but looking at the picture on my crappy cell phone it sure looks like light stress is a contributing factor to what's going on. High light levels like high feed and warm temps in the 80s. It could be that the light stress has brought on the deficiency you're seeing. Coco is fairly different in how you water and is much more like hydro than soil. I use soil and dry amendments so as to the best fix for the deficiency I'm kinda at a loss. I'd for sure cut that light down by 20% for now and hopefully someone with a good background in Coco can help you out. Coco for Cannabis is supposed to be a good reference forum for that specific media, I'd give it a look if you have time.

Cannabis Grow Guide - Coco For Cannabis - Science and Practice

Cannabis grow guide: articles, tutorials, DIY projects & more! Dedicated to the science and practice of growing cannabis in coco perlite and other media.

www.cocoforcannabis.com

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Thank you. I put the light on 80% intensity.

growernotashower1 said:

Thank you. I put the light on 80% intensity.

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Did you check the lux readings at that level? You might want to, just to be sure it made a good difference in output. Hope it works out for you and you have a good harvest.

It is getting too much nitrogen. Dark/shiny curling leaves and burnt tips, classic Nitrogen toxicity.

Autos need much less feeding than photos. Remember that most CalMag products add extra nitrogen. I'd drop the CalMag and feed at a lower concentration.

leafs look good, just let it grow and develop more. if its in coco id start my plain watering at this point, the plant has all the nutrients it needs.

Joe.Grow said:

leafs look good, just let it grow and develop more. if its in coco id start my plain watering at this point, the plant has all the nutrients it needs.

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Shouldn't I do that the last 2 weeks? I'm a noob, but to me she looks like she has at least a month until harvest. Many white pistils and straight as well as not dense enough imo

Joe.Grow said:

leafs look good, just let it grow and develop more. if its in coco id start my plain watering at this point, the plant has all the nutrients it needs.

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You'd start to starve a plant not even half way through flower?

Joe.Grow said:

leafs look good, just let it grow and develop more. if its in coco id start my plain watering at this point, the plant has all the nutrients it needs.

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Wut?
Who's sock is this

growernotashower1 said:

Shouldn't I do that the last 2 weeks? I'm a noob, but to me she looks like she has at least a month until harvest. Many white pistils and straight as well as not dense enough imo

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No, you should never do that. Dont listen to that guy he's been all around posting ridiculous advice.
Seems like you already know more than this guy though!