It is a bristle worm guaranteed if you have one you will have a lot more not seen vast majority are harmless and make a great CUC however never handle them bare handed as their bristles will give you anywhere from a mild jolt to full on pain.
2 species not generally accepted as being safe in your system are fire worms and enucid worms both are easily identifiable.
I personally am not a fan of bristle worms but I have way too many so I have learned to live with them
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 My aquarium is nothing but a smorgasbord for my cats.....
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