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Veterinarians will prescribe medicated water with formalin and praziquantel. Once the fish is placed in the water, the medications should eradicate any parasites.
The fish's environment should be cleaned and sanitized to prevent Dactylogyrus and Gyrodactylus infections. And any new fish should be quarantined or isolated before it is introduced into an environment filled with healthy fish, especially if the fish is suspected of having such infections.