Help ID this worm-like thing

[b.jasho]

I was sifting through substrate doing some cleaning when this guy popped out. 4 inches or so in length. Is anyone able to ID it? Is it harmful, beneficial, or benign? Any help is appreciated

 

[AydenLincoln]

Bristleworm not welcome in my tanks! I hate them some may like them. Don’t grab them with your bear hands they have bristles that sting.

 

[Mr_Knightley]

I would need to see the head, but it looks like a Eunicid (= bobbit) worm of some sort. all Eunicids are predatory as far as I'm aware, so I would get it out ASAP.

 

[b.jasho]

I would need to see the head, but it looks like a Eunicid (= bobbit) worm of some sort. all Eunicids are predatory as far as I'm aware, so I would get it out ASAP.

 

[mww00ds]

Bristle worm, natural part of any tank CUC. They might be ugly but only really come out at night. Some do get big enough to bother prey on fish when either there is a lack of food or the fish is sick. Personally I don't mind them as long as they behave themselves

 

[Mr_Knightley]

Looks like a fireworm based on the red spines on the sides, which are predatory. Could also be a large bristleworm, though I'm not sure I'd trust a bristle that big with small fish. Your call.

 

[kjkszpj9]

almost looks like a bobbit worm cause i see no tuft of hair on the body, but its probably not THE bobbit worm just some other Eunice worm.