The macro like calcium, sulfates, potassium, etc. are easy.
Incorrect. The macros are nitrogen, phosphorus, and potassium.
Those are provided by doing large and frequent water changes and feeding your fish a varied diet, so they can contribute the rest of the macros.
In your low-tech, non-CO2, and presumably low-light tanks this is possible. However, Jason clearly stated he has a high-tech, CO2, high-light tank.
You are giving inappropriate advice based solely on your personal tank style, rather than advice relevant to the tank style being discussed.
I use "Earth Juice" liquids at about $13.00 a quart, this stuff is very concentrated and a bottle lasts well over a year and I dose six tanks a couple of times a week. This fert is organic, so I don't have to worry about water condition problems.
Earth Juice's basic "Grow" formula contains: Oat bran, sea kelp, bat guano
, steamed bone meal, natural potash, blood meal and feather meal.
This is NOT a suitable fertilizer for any tank containing livestock! In fact, it's not a proper aquatic fertilizer at all...