There is no secret ... we all have access to great forums here that walk everyone step by step through *their* favorite dosing strategy ...
There are lots of right ways to do things ...
And there are so many different tank setups ... each which require their own different approaches or strategies ... some people have high light, some have low light, some have CO2, some have DIY CO2, some have high plant mass, some have low plant mass, some have high fish populations, some have low fish populations ... the variables are significant ...
My favorite example ... is when I had Discus in my 180 gallon tank ... I never dosed Potassium Nitrate for over two years ... I did 20% daily water changes, had 2.5 watts per gallon, pressurized CO2 on automated controllers, densly planted tank ... why? I feed my dinner plate sized Discus an aggressive diet of raw beef heart ... my plants got all of the nitrate that they needed from the fish food and fish waste ...
Bingo ... That is the best answer! My advice is always the same ... read about the different dosing strategies ... choose one that makes sense to you and matches your lifestyle ... then follow it consistently .....
Thanks,
Greg