Bristleworm Good or Bad?

[HaZRaTTy]

So,

During a small re-scape for some corals and what not I found a Bristleworm in the sand must have fell out of the LR.

I have read good and bad things, just looking for a general consensus what you guys think. Where should the dude go? He's approx 1.5inches.

I've read to keep them, I've read to get rid of them.

Thanks,