Octozin is a treatment for internal parasites such as those which cause sleeping sickness hole in the head seawater angelfish and clownfish disease malawi bloat disease and also early stages of dropsyr octozin may also be used to treat whitespot in seawater aquaria where cuprazin cannot be usedoctozin is harmless to invertebrates and algae when used as directedr you will require three separate days of treatment to complete the courser octozin is active for up to 3 days after the las