Look, let's keep it simple here and look at nutrients in tiers..
Light, Hydrogen and carbon - your plants use these in mass quantities to make sugars/starches which feed them, and cellulose that is the structure of the plant. The plants are in water (hydrogen), you use pressurized CO2 (carbon), and presumably have decent lighting. You might have some minor light/CO2 tweaking to do, but that's not really what most think of in terms of fertilizers.
Macronutrients (N-P-K), among the fertilizers, these are the most used heavily by plants. You are probably low on these given that you are dosing CO2, but no deficiency signs are present yet based on your descriptions.
Secondary nutrients Calcium (Ca), Magnesium (Mg) and Sulfur (S). Plants use moderate amounts of these. If your water isn't very soft, it will provide Ca and Mg enough for plants that aren't hard-water specific as long as you are doing regular water changes... Your root tabs provide lots of sulfur, and Flourish comprehensive provides a bit more. You're probably OK here, assuming you don't have super-soft water.
Micronutrients - Iron, copper, zinc, boron, etc, etc.. plants needs quite small amounts of these. Your Flourish comprehensive and flourish trace should provide all you need here. Maybe you might need more iron if you have iron-demanding plants, but this will show up as obvious chlorosis (leaves turning yellow with green veins) in the plants.
Of course, all of this is somewhat general, we haven't discussed what plants you are growing.. some plants have higher demand for some nutrients than your average plant.