It's not a deficiency, it was toxic on some mineral or element, causing lockout. Looks like P. And As I mentioned to Big Sul, nutirent related plant problems start days to weeks before you see it occur.
Just received this directly from NLS:
"It is highly likely a cal/mag issue. We have noticed a pattern with HF and suspect that they are no longer buffering their coco coir which saves them money but unbuffered coco coir (the main ingredient of OF) will hold on to calcium and magnesium"
"PS add some cal/mag to your water and she will be fine"
This is just another piece of the puzzle. What say you "rabbi's"?
I have on hand the following: (all unopened):
Botanicare Cal-Mag Plus
Recharge
MegaCrop
NLS Girl Flower Power(opened)