Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
If you're following normal EI to the letter, you dose micros and macros on alternate days. Iron is important enough that it often gets spoken of separately, but it's still a micro, and gets dosed on micro days.
But really, it's remarkably uncritical. You can do half doses of macros and micros every day, if that's easier to remember. A bit of the phosphate may react with a bit of the iron, resulting in slight cloudiness - but few people see this, or notice any difference for the plants.
The Equilibrium gets dosed right after your weekly water change.