過マンガン酸カリウム
There are several treatments for anchor worm in the aquarium/pond. Potassium permanganate is usually considered the best treatment and can be used either as a tank treatment or a "dip". Other treatments include a salt dip, a formalin dip, and modern antiparasitics may help. Salt in the aquarium at 1 to 2 tablespoons may help prevent secondary infections.