I believe that this subject has been explored before...either on this board or another.
From what I remember, it doesn't matter when you dose, as long as you do it!
Macros one day, trace and iron the other day, 50% water change once a week.
I used to dose my iron with the macros, but I read that it helps induce green spot algae that way.
30g planted with cories, white clouds, Harlequin Rasboras ,ottos.
10g planted with glowlight tetras and an otto.
Outdoor pond with one common goldfish and comets.
5.5g with endlers.