There's no cardinal rule about not dosing macros and micros at once. PMDD formulae do that. However, the PO4 will bind with the chelated iron making it unavailable for plant use. So if you have plants that need more iron then you'd have to dose iron on the off days, so it kind of defeats the purpose of all-in-one, so might as well alternate anyway.
CO2/Metricide will not only not cause problems with ferts, but with dosing, becomes the limiting condition, and if not utilized, can cause algae problems you never had before.
With no dosing and no CO2/Excel, you're limited on multiple fronts, so by limiting light, everything is restricted, but provide more light and dose without a carbon source and you're headed for a world of algae pain.
Just a word to the wise that dosing is not the solution to everything. You can choose to dose or not dose, but dosing has its own set of implications.