Additives question

[Tyfighter]

With what you have there I would just keep up with regular water changes. The above poster nailed it with only dosing with what's too low. People have a tendency to want to do too much with additives but it gives a way greater chance of things getting thrown off.
I once read. "the only thing that happens fast in this hobby is when thing go wrong."
Usually the less I do to my tank the better it looks.