I'll be honest but I think potassium has nothing to do with what you are experiencing unless you severely overdosed and by severely I mean you dumped the whole botte and some. Many people and me included dosed EI levels of K. That is 20-30ppm of K.Hey there @Hanuman. Michelle here from the states. I came across your post, as my panda garra suddenly seems to be going downhill quick. I was unaware, but I dosed my tank 2 days in a row with potassium. I guess it could be potassium poisoning, but tetra's, and otos seem to be fine. I have had him for roughly a year, happens to be my favorite little guy in the tank (fully planted rainbow tank, with one tetra and a couple otos and the panda) my plants were not growing so great, so my local fish store told me to dose potassium for 2 days. I'm just wondering if you have any idea what happened to yours? Sorry to hear about the loss of your other ones. Never a good feeling. Thanks for any input, Michelle.
In my case I was never able to find what the reason was. Only one survived for some reason and he is doing just fine. He never exhibited any of the symptoms other did. All other fish in my tank are doing just fine. Only thing I can think of at this stage was that they died of some disease or genetic disorder or whatnot because I can't find any other explanation.