Hi PW,yes you are rightI thought Fe deficiency started by the stem and went out towards the leaf edges. I'm leaning to it being Mg or Zn deficiency but that's just what I'm guessing.
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Yes Fe deficiency starts from the stem....
I had a problem of Fe deficiency on my lemon tree (outdoor) ...and if the Fe problem continues and you don't do something....
The plants really need a loooot of time to recover....and along with the Fe as food I advised to give the lemon tree all the elements in the food ,to help it recover sooner....
That's how i can help you!!!
Thandee here!!!...i hope all will go well to you and your plants...