Good or bad bristleworm?

[CableGuy86]

I hear the red/purple are good but I had this guy floating around the bottom.

 

[CableGuy86]

This one was solid pink maybe.... It def did not have any Purple and was pretty fat looking.

 

[ermartin]

doesn't look like a bristle worm to me...

 

[Tahoe61]

Looks harmless enough to me. I have yet to hear that theory.