Flourish Which one? Comprehensive? Other?
Flourish Excel Follow label directions. Skip the loading dose if you have sensitive plants. For example Valisneria is one that does not care for this product very much, but seems OK with the low dose.
Flourish iron Follow label directions
Flourish phosphorous Follow label directions
Macro micro mix from aquariumfertilizers From their site: "Macro Micro Nutrient Mix 1 lb contains 1 equal part each of Potassium Nitrate, Potassium Sulfate, Magnesium Sulfate, Plantex CSM+B"
With high light, use the higher end of the labeled dosing.
The element plants use the most of is carbon. Keep dosing the excel, daily if you can work out a schedule.
The elements the plants use next most of are N, P and K. These are macros. If your tap water is adding N, then you might need to modify the dosing (even down to not dosing N). Read the labels on the products you have. The Aquarium Fertilizers product has N, so you might dose this only after the NO3 from your water is getting used up. Does the NO3 level drop through the week? The plants are using it. Dose toward the end of the week.
P- Yes, dose according to the label.
K- do you have a source of potassium? The Aquarium Fertilizer product has K2SO4, this is a reasonable source of K if you are using enough of it. But with the nitrogen problem you are probably not dosing enough of the blended product to get enough K. (MUCH better to get each material separately, order only the ones your tank needs)
Elements plants use in moderate amounts, secondary nutrients:
Ca, Mg, Fe and a few others. Usually supplied by tap water, fish food. If the GH of the water is at least 3 degrees then there is enough Ca and Mg for most plants. If you dilute your tap water with RO you might have to dose GH booster. Depends on what the GH ends up after the dilution. GH booster often has K as well.
Magnesium sulfate in the aquarium fertilizer blend will raise the GH, but without supplying the Ca that the plants need. I do not like it when they force you to use what your tank may not need, and in the wrong ratios.
Fe is the secondary nutrient that may be in some trace mixes, but most plants seem to need a bit more, so dosing it separately is good. If you have multiple sources make sure you are not over dosing. The aquarium fertilizer blend includes CSM+B, which contains some iron. Since I do not think you will be using much of this I would dose the seachem iron.
Elements plants need in smallest amounts. Micros or Trace minerals.
The Micros from Aquarium Fertilizer is CSM+B, and the Comprehensive (if that is what you have) are both micros. Dose one or the other, or alternate, or whatever works for you. Read these labels for iron, too. Many people will use certain trace mineral formulas (like CSM+B) and add some extra iron.
Here is how I would dose:
Enough N to keep the nitrate between 5-10 ppm, and a bit higher is just fine.
Enough P to keep the ratio of N:P about 10:1. The exact ratio is not important, just a lot more N than P.
Plenty of K. I understand the tests do not work well for K, so I do not know how, except by following label directions.
Enough Fe. If you have more than one source, then follow low-end instructions on each one, knowing that the combined dose will end up in the right range.
Micros: I would alternate so that if one has something the other is low in the end result is that through the week all the elements are supplied. Do not overdose.
Day 1: N (if needed), P, K, Excel
Day 2: Micros (comprehensive), Iron, Excel
Day 3: N (if needed), P, K, Excel
Day 4: Micros (comprehensive), Iron, Excel
Day 5: Use the Aquarium Fertilizer product today. And Excel.
Day 6: Micros (comprehensive), Iron, Excel
Day 7: water change. Supplement the water if needed with GH booster.
In the future:
Buy separate products from Aquarium fertilizer and dose according the the Estimative Index.
K2SO4 (if needed)
GH booster (if needed. Do not substitute magnesium sulfate.)
Hard water = high GH? high KH? Both? Do not dose any GH booster, nor magnesium sulfate.
And if the people who posted ahead of me say that flourite substrate supplies enough iron, then skip that, or very low dose only.