Very Large Bristleworm Questions

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AustinW78

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Hello everyone, I have found a bristleworm in my tank which is around 6 inches long and almost 1cm wide! I have a 40gal breeder and am just wondering if anyone has any idea if he is safe to keep? I would like to if possible as he is cool, but I worry considering I have a couple of small goby species as well as some crabs and conchs. Do I have to worry about it killing my fish or inverts? He seems to be happy munching on the rock work. I am having trouble identifying his species. Thank you as always!

20260502_111611.jpg 20260502_111115.jpg
 
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Here is a short clip I got of it as well
 

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Bristle worms are beneficial detrivores.
 
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