You can set up a "normal aquarium" or if you add strong light, CO2, added fertilizers you will need all three. There is no point in using only one or two of the three. There are a number of suitable substrates out there to provide micronutrients to your plants and I have not used frourite so can't advise there. I prefer to use sand rather than gravel and have done for many years. It is all a matter of personal preference realy.