chelated iron oxidizes quickly in an aquarium, which is why you see recommendataions for frequent dosing.
If you dose traces, and your trace mix contains some iron, don't dose iron separately on the same day...alternate them.
On a lower light tank, every other day for iron should be fine. If you are not seeing symptoms of an iron deficiency, then you should have plenty.
Former advisor and planted tank geek...life's moved on though.