👍This is the question for Tropica as well, why they choose to dose little K way before they even came up with the root tabs and why they choose to dose higher N than the K. Tropica never said to dose more K if you have a high tech setup, they simply said to dose more of the Tropica dose, which still ends up with less K than the N. its best to hear from Tropica why they choose to go this route.
Soil. Nature doesn’t have high K in water either. It’s in the soil.
You don’t need root tabs to do a planted tank.
But once the soil is depleted, and the scape goes downhill, you need to bring it back somehow or proactively.
All I’m saying is K is very important. And unlike N and P, you can’t get it from the system. We aren’t running our water through rocks on the way back remineralizing it.
What you put in is what you put in. But not for N and P.
I know locals who hate Tropica ferts - they have to top off with seachem K.