Excellent Result - Must Use !!!Buy It Now Suitable For All Aquarium Fishes Proven Formula For External And Internal Parasitic Infections. Paracidol - Fw Is Very Effective Against Koi Sleeping Syndrome And Also Against Argulus Sp (Fish Lice), Lernea Sp (Anchor Worm), Gill Flukes, White Spot / Ich, Costia, Hole-In-The-Head Disease And Other Parasitic..