Colombo Lernex is a treatment that can work against Macro Parasite such as Fish Lice (Argulus) - Gill Lice (Ergasilus) - Anchor worms (Lernaea) - Internal Roundworms (Nematodes) and Leeches (Piscicola Geometre)
Skin and Gill worms are flattish. 0.3-0.5mm in size these are now becoming more common in pond fish. If required, repeat the treatment after 14 days.