you probably have no macro nutrients aka nitrogen, potassium, phosphates.
none of what your dosing will have these. With a large fish load and regular feeding you should be able to get enough nitrates and phosphates, maybe.
you should look into dry ferts, k2so4 ( potassium sulfate) and kno3 (potassium nitrate) and k2hpo4 and plantex csm+b (micronutrients) once your flourish runs out (flourish comp is micros but overprices watered down)