And you'll always fin that, there's no such thing then "one way and one only" in the tank world. What works for one will not work at all for another one etc because there's simply TOO many factors that can influence it, slightest differences in parameters, lights, substrate used, close or far to natural sunlight from outside, amount w/c etc etc I mean this list is ENDLESS and so are the options what to do.
Over time you will find what works best for you & your tank
The only reason I asked about your combo of pH and KH is to see what your current CO2 level is. While its great for plants, it can be not so great any more if you're already having a high CO2 in there and then add even more. Is all about the right balance in the fish world