eSHa -ndx is a levamisole-based roundworm treatment. It works against parasitic nematodes like Camallanus, Capillaria, Pseudocapillaria, Eustrongylides, Oxyuris etc. Roundworms are generally found in the intestines of the fish and some can be visible to the eye. eSHa -ndx is well tolerated by ornamental fish in freshwater and marine aquariums.