‘O’ Anchor Worm & Fish Lice Treat all external parasitical diseases (Anchor Worm and Fish Lice) problems for Arowanas, Stingrays and all rare / exotic sensitive fishes. Solely owned secret formula. -Treat all Anchor Worm and Fish Lice attacks on Arowanas and Stingrays -Effective even to kill the eggs and lava of parasites -Can be used to treat crustaceans e.g. Tichodina and Gill Flakes -Mild and safe and suitable to be use with sensitive wild caught fishes -Not only for treatment purposes, also for prevention purposes -Totally harmless to filter beneficial bacteria Per 10 liters of water. For protecting 1 ml.