What is this little white worm??

[Aquatic Impressions]

Sorry for the picture they are two small to get a good pic but i was wondering what ot was best description I can give is little white worm crawling on the glass there are thousands of them on the back wall glass rocks etc is it a type of copapod??

 

[James M]

Could be a dorvelleidae worm, but hard to tell

 

[KJ]

Look like flatworm.