Help identifying white worm

[Shell Script]

I was turning off the lights in my aquarium when I spotted this white worm swimming in an S shape around my tank. I removed it because I have no clue what it is. I've seen bristle worms before but i've never seen them swim and i've never seen them in white. the worm's about 1 cm long. I've included photos down below. Any clue to what it is?

 

[Ziggy17]

Looks like a dorviilledae. If it is, no harm, eats algae.

 

[Shell Script]

Looks like a dorviilledae. If it is, no harm, eats algae.

After looking that up he does seem to be a dorviilledae. Thank you :)