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Detritus worms are tiny, thin, white to tan segmented worms that live in your substrate and eat leftover food and waste. They’re harmless to fish, shrimp, snails, plants and people, and a small number in the gravel is a normal sign of a living tank. You only notice them when … Read more about Detritus Worms in Aquarium: Are They Harmful and How to Get Rid of Them