Speaking for myself, I do not like to dose anything in excess. I give the plants exactly what they need and no more.
I also enjoy testing my tanks to insure that my fish have the best possible environment for the sake of their health, which is why I got into this hobby in the first place.
I do enjoy my plants, they are beautiful and my critters enjoy them, but my critters health is my 1st priority.
IMHO, making my critters "gasp for air" or stressing them out needlessly is unexceptable to me. I chose them, they did not choose me, so I want to give them the best life I possibly can. Yes, I could go sniff some glue, but I choose not to because it bad for my health...lol. Why would I put my critters through things that are bad for them? They have no choice in the matter and they can't just swim away to a better home. I am their keeper and I choose to do it to the best of my ability for them. You know the saying, "do no harm". I try very hard not to.
Anyway...Potassium is one of the most important elements, so why not test for it, instead of guessing? I know that testing with some kits will only give a close estimate, but I find it is better to get close than blindly dosing, hoping I am close. I am not a mathematician, so testing is my best option.
Most Reefers test religiously for what they are adding to their tanks. Freshwater tank are investments too, so why not test?
I am blessed to have the time and money to test my tanks and I would also love to know what potassium test kit is good for freshwater, instead of a question being brushed aside with "it is not needed or necessary" or having to explaining the reasons why we would like to test.
So, with this said, is there a good freshwater potassium test kit that fresh water aquarist can use, if they chose to? Or is there a reef kit that can be "tweaked" for freshwater?
If you have any experiences with potassium testing, I would enjoy your thoughts, expertise, time and help.
Have a great day and I look forward to helpful replies.