Why All-For-Reef don't have potassium

[Lou Ekus]

My goal is improve values of elements, almost all or all.. I don't care...

So, for you Lou, what the best tropic marin product to do this?

-A k
-all for reef
-pro coral mineral
-others

My favorite was all for reef but it's doesn’t have potassium..

If you are talking about "trace elements" alone, then AFR is not your answer. AFR is mostly for Ca and alkalinity. The traces in it are to "maintain" proper concentrations due to usage from the AFR being added.
For Trace elelement supplimentation alone, the best appraoch is Trace A and Trace K. If you want to boost Potassium, you then need to also add Potassium separately. Potassium is not considered a "Trace Element" due to the high concentration in the salt water solution. Here is the product I would recommend for Potassium concentration increase:
https://www.tropic-marin-smartinfo.com/potassium?lang=en
I hope this is helpful.

Good luck.