i havent use it for over a year now and fish havent died through unknown causes. i have lost fish to whitespot once or twice but thats about it
white spot is usualy caused by adding cold water
white spot is caused by poor water quality
Sorry to have to disagree. Whitespot is caused by a parasite, it is a parasite. When the parasite is present, the disease affects the fish, when it is not present the fish do not get whitespot. I do add cold water to some of my tanks on purpose to stimulate corydoras breeding with no problems. When I brought home some female bettas without inspecting them closely enough, they showed whitespot within a couple of days in the QT. Once it was cured, they continued on in my tanks for another year or more before I had a contamination problem that killed their whole tank in a week. I never let my bettas be exposed to cold water, you might say that I am fanatic about it.