I assume you ordered some GH building and have baking soda or plan to blend a little of the tap with RO?
Shoot for a KH of 2, GH of about 3-4.
You can use SeaChem Equilibrium for GH.
I'd do 50% weekly changes.
Dose 1/4 teaspoon of KNO3 2-3x a week
Dose KH2PO4, 1/16 teaspoon 2-3x a week
Traces: 5mls 2-3x a week.
Good CO2, 30ppm.
Plant dense, do not use any large swords, provide areas for breeding.
Feed frequently rather than a lot at once. Live brine with other food.