When reading over posts about doing this or that, the common advice about various supplements is that you should not dose things that you are not testing for. So, most that dose K+ test for it and try to maintain 380-410mg/L. In a lot of cases, this level is maintained fairly easily by water changes with salt mixes that contain about this amount of K+. With weekly testing, one can develop an idea of what the K+ consumption of the tank is and develop a dosing regimen.
The K+ maintanence is part of the zeovit dosing regimen. I don't know if dosing and testing for K+ without following some or most of the other tenets of the the schedule would be helpful, but I can share that four weeks into following the zeovit "way", my tank has improved.
