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I'm going to have to disagree with you there. Nitrogen deficiency is characterized by a uniform yellowing of the lower leaves. The pictures show more of a rust colored spotting, along with large necrotic patches.
I have to agree with Buddy on this one.
-------------------- Dude she isn't as young as she use to be.
I doubt that's causing it. If it's only a few drops per gallon like you said it should have very little effect. The leaves that have been affected are not going to look any better. As long as it doesn't look like your progressing you should be fine.
I would flush way more than 2 gallons through your medium. Usually the recommended flush is a minimum 3x the size of your container. You can go with even up to 5 gallons as long as you have a soil that drains well.
-------------------- Dude she isn't as young as she use to be.