Yes folks! It can be a bit crazy, but there is Potassium in all of the above. The level of K uptake can vary from tank to tank, so its need can be demanding in some situations more than others.
That said, K is the one thing that is unnatural to a planted tank. In KNO3 (yes its not a zero, its a letter), the N, Nitrogen, is what we are after. This can be naturally occuring in most aquariums through the basic Cycle. Ammonia (or ammonium) is providing N, Nitrite provides N and then of course Nitrate. P can be acquired through most fish foods.
So, in a lower tech lower light set up, sometimes dosing is not even needed since most of the nutrients can be had from what is already ongoing. The K can be supplemented in any form just to keep things nice and green.
In higher light setups, the demand for additional nutrients will go up, thus the supplementation of the standard macros (I incude C in the Macro grouping since Carbon is a major component of photosysnthesis, but others may disagree with me).
We are fortunate when we "mix our own" chemicals because the K is in so many compounds, thus the need to always use K2SO4 is subjective and not always needed when using other compounds.
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