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So I forgot to mention this earlier. The day we all had power outages everywhere, I believe it was saturday evening, I saw a HUGE bristle worm coming out of my live rock. It was about 4-5 inches out of the rock and who knows how much more of it was still in the rock. There was no light, no flow.......nothing. I shined a flashlight at the tank to look at everything in it and that's when I saw it. I tried getting it with some tweezers and it slipped and retracted back into the rock. I haven't seen it since. How can I get it to come back out???

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I'd leave him be. He's beneficial.

If you don't want him, just look up how to build a soda bottle trap and catch him that way. Works pretty well.

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I read a while back that they were good if they were small, but if they got big they could be aggressive and even attack fish. Is that right or should I not worry about it???

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They got a bad rap, but really they are good. Eat decaying / dead stuff, basically they add to your CuC.

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I read a while back that they were good if they were small, but if they got big they could be aggressive and even attack fish. Is that right or should I not worry about it???

I don't believe this is correct. As far as I know, the only worm that attacks fish is the Bobbit Worm. Most likely someone saw a worm eating a dead or dying fish and they drew the wrong conclusion.

Coral Bandit Shrimp, Serpent Stars, Emerald Crabs, Arrow Crabs and Blue/Purple/Red Lobsters are all typically sold as CUC and they are known attackers of fish as they get larger.

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Bristle worms of that size aren't inherently bad, but I know that I removed ones that big because they annoy corals, generally disturbed/moved things, and filled my fingers with bristles when I accidentally brushed against them while moving rock or corral myself. Just like a snail, crab, or other critter that became I troublemaker I didn't hesitate to remove them when they become a problem, but don't feel that you need to remove him just to get rid of him.

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I'd probably get rid of it if it's a eunice or fireworm. I don't think I've ever seen a normal bristleworm get past a few inches, but they should be fine if that's what it is. Dorvilleidae are fine as well, they definitely stay small though.

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Nothing to worry about. Just don't poke it with your bare hands or you'll get an nice itchy/burn/fiberglass feeling.

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Well then. No touching the worm. Got it. Haha. Thanks guys. Really appreciate the help.

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