It's a bristle worm. They are only bad if you have seahorses as they can snick them on purpose or by mistake. They are good at clean up but of course you do not want them to get out of hand. Most live rock comes with bristle worms so they get into your system.
They can be a nuisance if you have a ton of them, but in small quantities they don't do much harm. Just about every marine tank has them. Similar to aiptasia. Almost impossible to be 100% free of them, just do what you need to reduce their numbers
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