Need help identifying creature..

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efdiaz

Aquarium Advice Apprentice
Joined
Feb 19, 2014
Messages
11
So ive noticed black thin almost thick hair like creature in my sand bed against the glass... but today i noticed tons of them just barely coming out of the sand just wanted to know wat they where and if cause any threat.. :thanks:
 
Thats a pic of what i need help with!
 

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They are just beneficial polychaete worms that live in your sandbed. I have 100's in my tank. They aerate it and eat detritus
 
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