Poorly fast and vast

[No names left]

Hi guys so I threw 5 heavyweight fast and vast down and there all doing fine bar one which has recently started showing a few dying fan leaves. It's still budding well and the other 4 look fine was just wondering if this is a deficiency and what sort and also if it's a deficiency is this not enough or am I burning her my ph is spot on as there all eating the same. This one plant does look different to the others tho and the buds look like there going to be a lot fatter

 

[No names left]

Also there all 52 days old and are only fed on 5ml canna a+b and 0.5ml of buddhas tree pk918 per litre

 

[No names left]

This is her in full

 

[GoAuto6]

Bigger girl means bigger feed!

 

[namvet25]

What is your input feeding ph? Are you using calmag?

 

[Waira]

.... looks like P defc to me, with the larger necrotic spotting,... Ca can present similarly, but more rarely like this,... we need more info to pin it down though, so please fill out the patient form in the highlighted section above this one,.. copy/paste it here and fill in,...