Black Worms vs. Tubifex: A Comprehensive Comparison  Black worms belong to the genus Lumbriculus variegatus, characterized by their dark brown or black coloration. In contrast, tubifex worms originate from several genera, such as Tubifex (often red) and Limnodrilus spp. (typically grey). These live aquarium foods differ notably in a few key aspects: Color: As mentioned, […]