How long does it take to disinfect a fish tank with potassium permanganate?

Disinfecting a fish tank with potassium permanganate usually requires soaking for 1 to 2 hours. First move the fish and the top layer of water into another container, rinse the tank briefly, then fill it with clean water and add the right amount of potassium permanganate solution. After soaking 1 to 2 hours, pour out the disinfectant and rinse thoroughly with plenty of clean water. A tank cleaned with potassium permanganate must be re-cycled before fish are returned, to avoid irritating them. Also, potassium permanganate is strongly corrosive, so avoid direct skin contact during use.