Don't bother with the 10% at all then, follow the suggestions on the article, that will address the needs of the plants and prevent other issues from other nutrients besides K+.

You do not need to do any changes is more the point.

Just after a large trimminmg or if you plan on disturbing the substrate/uprooting etc.

Otherwise, hands off.

Do not mix the methods and do 1/2 way with the water changes, you are not preventing any significant build up etc with 10% monthly.

So do not even bother, you don't need to anyway.
You'll dose once a week if you follow the guideline I suggested in the article.
That's all, and the KNO3 sounds like it will be needed, not KCL. You have no NO3 as it is.

So adding a bit 1x a week is fine in a small amount, perhaps 2-4ppm for NO3.
There's plenty of K+ if you do.


You do not need 10ppm etc K+ for such a slow growing tank, the same K+ for such a tank's NO3 uptake is about .5-1.0ppm per week, not much.

Regards,
Tom Barr




Regards,
Tom Barr