Bristle worm?

[MidnightF66]

Sorry was at work. The 1st picture was in they were left out. The 2nd is one I just found in my tank when I got home. Sorry my phone sucks at taking pictures

 

[MidnightF66]

Not a Bristleworm but a species of fireworm known as hermodice carunculata. Here is a pic below to confirm for you

Other possibility is a capitellids commonly known as lugworm which resemble an earthworms and have similar habits

That might explain why my GSP and ducans might be ticked off at the moment.

 

[Brittany Marie]

Honestly looks like Pholoe minuta. If you have a magnifying glass, look at the head and see if it has 2 black eyes.