Too hard to tell from the description really... a common worm seen in home aquaria that need ID'd are called bristle worms... next time your looking, check for bristles on the ends of its body.. (just dont touch them! ) haha
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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