Swimming wiggling worms

[Dresden]

Largest was about an inch long, white(i think) and wiggle really really quickly. Very fast even in strong current.

couldn't find anything under search and search on reefcentral.com isn't working for me.

i saw about 5 all over my tank last night, very hypnotic, anyone have any information on these worms. They came out last night, i usually peek in the tank and night and have never seen these before.