Is this a toxicity or deficiency or what?

[Animatey]

Yea thats what i saw, the earliest stages of yellowing between the veins.
Sudden spikes in nutrients can cause need for other elements like mag, etc. Thus the early sign accompanying the tip burn.

There is a lot of unseen cause and effect in growing for sure! Lookin good otherwise!

Good eye... I didn't actually even see the lower leaf did have some yellowing in the veins jussst barely starting. This lends credence to the idea it's deficient (probably mag and potassium) and not burnt.

Tough call here but I'm going with under fert... Thanks for taking a look!

 

[Mikis]

Do you think you have it sussed out then mate?
If so can you post back in here with a few pics and a brief description of how you fixed it?
Knowledge is power and all that jazz lol ✌✌

 

[Animatey]

Do you think you have it sussed out then mate?
If so can you post back in here with a few pics and a brief description of how you fixed it?
Knowledge is power and all that jazz lol ✌✌

I'm thinking so... I posted same thing in another forum infirmary and they were all split down the middle if it was burn or deficiency.

I think though @Stooby snacks nailed it by spotting the early signs of Mg def in the lower leaves. I was focused on the orange tips.

I'd say it's just generally under fed.

She perked up noticably a few hours after I added the feed but it will take a couple days before we can know if she is past it.

I'll definitely post back results though thanks for taking a look!