I hadn't supplemented anything in my tank for almost a whole year. After a few tests came back with low alk
and cal I started doing 2 part solution from B-ionic.
For the most part if your diligent with weekly water changes your nutrients will be replenished.
Just my opinion.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley