Worm ID

[Hnguyen]

Can anyone ID these 2 worms please? First one looks to be a long thin white worm, no markings and thin like a thread almost.

2nd one looks to be pink body with a black head and yellow tail.

Thanks in advance for any help.

 

[Jackony]

Second one bristle worm? Mixed on good or bad for tank, I think some can get pretty big?

 

[duberii]

Not sure if you found out what those white worms are, but from what I've heard they're baby tubeworms that aren't sessile yet, and once they find somewhere where they're happy, they will grow a tube and stay there for the rest of their life