Can someone pinpoint it!?!?

I’m growing these out to mom and clone however one of them seems to be lacking something or maybe fungal???? Idk the top left and bottom right are 24k by DNA and the top right is red ape by Solkana. This one that is sick smells drastically different than the other so id don’t know if its the pheno either.View attachment IMG_5710.jpeg

what kind of iron do you use

What nutes? How often? What soil?

Flush them with loads of water maybe
What size pots are they in

Is it draining properly? I thought Calcium def at first from the lower leaves, and probably some mag along with it.. but could be a drainage issue.. something in the root zone.

Slight over watering probably locking out mag.