You don't have to test for all those nutrients. Tests for micronutrients in particular are expensive, and you will be trying to test for miniscule amounts.
If you give us an idea of what kind of light you are using, and your tank size, we can give a better recomendation of how you should be fertilizing. If your light levels are fairly low, you may be able to get away with an all in one, comprehensive aquarium fertilizer of the type which is easily found in stores. If you're running high light and CO2, most of us buy dry fertilizer as mineral salts.