Assertion: sludge worm | /r/ObjectUse | used as a tropical-fish food
Facets:
Source sentences:
text: Included are worms of the freshwater genus Tubifex, also known as sludge worms (class Oligochaeta, family Tubificidae), which are used as a tropical-fish food.
text: genus Tubifex, also known as sludge worms (class Oligochaeta, family Tubificidae), which are used as a tropical-fish food.