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When using prazi to treat turbellarians: Dose once, wait 7 days, do a 25% WC and then dose again. If worms reappear after that use formalin instead.
When using formalin to treat turbellarians: Administer a 45 min bath and then transfer the fish into a sterile QT. Wait 7 days, and then rinse & repeat.
You always want to transfer the fish into a new/sterile QT after each formalin bath to prevent reinfection. I advise against prolonged exposure to formalin by treating in-tank.
Two Formalin treatments in total?