Just a heads up on treating anchor worm with salt...Some adult anchor worms have a tendency to survive high salinities, and one report cited the adult females surviving salinities as high as 22g/L (that's more than 20 tsp/gal) for 6 days. Recommended treatment concentration is 4.8g/L (about 5 tsp/gal) to at least prevent the worm larvae from developing. That is, of course, if the fish can tolerate such
salinity. Salt in lower concentrations can help with secondary infections on the wounds that the anchor worms cause though, as BettaNgold pointed out.
You did mention you had
potassium permanganate, that in itself is a treatment for anchor worms so should be effective on the larval stages. Just be sure to do it over the course of several weeks, as the eggs can take up to 30 days to hatch..