HELP! Does this look like nute burn or a deficiency? Week 5F first grow

[veloci]

Hello there. First time grower here. Entering week 5F. I'm giving her Advanced Nutrients Micro + Grow + Bloom base line (auto regulates pH perfectly) and adding Big Bud flowering booster now (PK booster).

The top of the plant has started to show these colours (it seems to be progressing on the way down).

My first guess is it's nute burn because of the burnt tips, although I'm feeding what the manufacturer says, which amounts to about 1200ppm (2300ppm at runoff which I've read can be managed by the plant at this stage?).

It's also a huge plant that I've tried to scrog (using this site's amazing guide) in a 8L (9gal) pot. And it kinda looks like Potassium deficiency according to this chart so maybe it could be that?

Any help would be appreciated.

More photos:
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https://imgur.com/a/lQv1Zyz

 

[90Gizmo]

needs cal-mag or pH is too low?

 

[9fingerleafs]

That looks like calcium deficiency. Could be a pH thing. Could be just lacking calcium. Or could be too much potassium. Just because the leaves are very light colored I think you could use some calcium nitrate (or calmag) something with calcium and nitrogen. The more nitrogen the better. Maybe your micro nutrient has both so I would increase that

 

[dirtymike]

Third pic, looks like its reaching up a little or closing up from to much light. ?? Cal/Mag def to. Good nutes.

 

[veloci]

Everyone suggested Calmag so I will start adding a bit of that. The runoff water ppm was twice what I was putting in so I did a flush and brought it down to 600ppm. Hopefully if it was a salt build up issue it will be solved now.

 

[Phlash]

A slurry test (ph & ppm) to see what’s going on in the soil should always be the first thing done as deficiencies can be signs of lockouts, also once she’s flowering forget adding nitrogen unless your a fan of hay

 

[dirtymike]

Yep, The N will surely make it smell like a barn. I've found that Black strap molasses takes alot of that away.

 

[Mollisol]

Hey dirtymike. How and when do you start adding Molasses? I bought some and want to use it.

 

[Bluey]

Looks like both to me. So the brown tips and the really minor brown saw tooth tips on the edges I'm pretty sure is nute burn. Run your fingers along the edge of the leaf, do they feel hard and sharp?
The rust spots and loss of pigment in the middle of the leaf is typical deficiency you often get in coco grows under good LED'S...cal/mag is most typical but it's more often than not a pH problem also, bit too low.
Correct me if I'm wrong I often have to look it up but didn't this time.
Edit. Having both burn and deficiency at the same time is likely wrong pH at the roots