Dynamite, Hydrochloric Acid dips, and bleach washes all work.....
but not recommended.
Injecting kalwasser paste, or boiling water directly into the little buggers sometimes work. Peppermint shrimp and Copperbanded Butterfly fish sometimes work. Whatever you do, do not scrape them in your tank, because their parts will make more babies. and....whatever you do, start the fight now, because the longer you wait the more problems you will have.
If you do a search on here, you will find lots of information, and aggravated Fish officionados.