Doing a quick search on the web brought me to a site called fishdeals.com which had this information listed for treatment
Anchor Worms Treatments Potassium permanganate dip at 100mg/2.5 gallons of water, or Salt dip Formalin dip at 2 to 4 ml Formalin/2.5 gallons of water for 30 minutes, the fish may lose equilibrium and must immediately be transferred to clean, fresh waterModern antiparasitics (such as Disco-worm, Fluke tabs, and Clout) may help Salt in the aquarium at 1 to 2 tablespoons may help prevent secondary infections*
The best treatment is to remove them by hand and quarantine the tank. You may have to do the following a few times. Tweezers work well for removing the anchor worms, try to grip them as close to the wound as possible. Periodically dunk the fish into the bucket of water to let him get a few breaths before continuing. After removing as many as you can see, use stress coat.
Also it seems the most recommended treatments I seen while briefly browsing were
Potassium Permanganate or Dimilin.
Sent from my LGLS740 using Aquarium Advice mobile app